Syllogism Shortcuts - Systematic Method to Solve Questions

Today I am going to share a systematic method to solve Syllogism questions. In every competitive exam, you will see at least 4-5 questions from this chapter.

I will start with explaining basic syllogism terminology which will be followed by practical examples.

    All

    syllogism basics

    Some

    some case syllogism

    NO

    no case syllogism

    Case #   All - Some


    Let! 
               You have 1000 $ in your pocket.One of your friend needs 600 $ to pay his Bill.He wants to borrow money from you.He comes to you and say,"Do you have 600 $ ?.What would you say,"Afcoss Yes!".Even if He ask for 1 $, or 999 $ .Your answer will always "Yes!". 
    So Overall you had 1000 $ which is called "All " or All of the money you had & What is your friend want some of the money like here 600 or it could be 1$ or 999 $ and what we call that some portion of money out of it.or " Some".

    That's why In " All " Case, "Some" is always true.

    Example: 


    Statement : All A are B.
    Possible Diagram
    Conclusion
    All A are B             
    Some A are B         
    Some B are A         
    Some A are not B     
    Some B are not A   ✘ 
    syllogism shortcuts

    sets
    Now Here we can see that A contains set of numbers. So we call it is as Set A and Same for B 'Set B'.
    All the numbers in A is contained by B hence All A is B true But All the numbers in B is not in A or not contain by A so All B is A → False.

    Now Let understand How All A is B → True But All B is A  False
    Let  Box A & Box B . Here We can see that Box B is inside the Box A Hence Box B can fit into Box A but Box A cannot fit into Box B.

    some cases syllogism

    Case #    Some - Some Not


    syllogism tricks

    Assume you have given the exam & you passed with some marks that mean you got some marks and some or not. Even if you passed the exam with 99% marks still you missed the 1%. So Even 99% is count under the same case.and 1% is also counted in some case.hence In 'Some' case 'Some Not' is true.

    Statement : Some A are B
    Possible Diagram
    syllogism questions

    Conclusion

    All B are A        
    Some B are A    
    No A is B          


    Statement : Some A are not B
    Possible Diagram
    syllogism

    Explanation



    Here we see that Set A & Set B has some common values hence we can say that Some A is B & Some B is A But there also some values which are not common in both A & B.So We can also say that Some A are not B & Some B are not A.

    Case #    No- Some Not

    no some not syllogism trick
    Assume You have no money in your pocket.So if you got no money.It means also that some money is not in your pocket.Having No means also some not.
    syllogism trick summary

    Point to Remember while Solving Syllogism

    • Anything is possible in a statement.                                                                                                        like  Some pens are fans. No fan is heater
    • Negative Answer will never be there.

    Simple Case
    Statement Conclusion
    Some All , No ,  [ False ]
    Some,Some Not [ True ]
    All No , Some Not [ False ]
    Some , All [ True ]
    Some Not Only Statement [ True ]
    No Some , All [ False ]
    No , Some Not [ True ]

    Possibility
    Statement Conclusion
    Some No , Some [ False ]
    All , Some Not [ True ]
    All
    No
    Some Not Some Not , All [ False ]
    Some , No [ True ]

    Some Examples

    Statement : Some A are B, Some B are C , All C are D
    syllogism example
    Conclusion
    Some A are not D ✘
    Some B are D       
    Some A are C       ✘

    Statement: Some A are B, Some B are C, No C is D
    syllogism example tricks
    Conclusion
    Some B are not D  ✘
    Some D are not B  ✘  
    Some A are C        ✘

    Statement: All A are B , All A are C , All A are D , No D is E
    syllogism example tricks
    Conclusion:
    Some B are not E 
    Some A are not E 
    No C is E              
    No A is E             
    No E is A             

    Statement: Some A are B, Some B are C, Some C are D, Some D are E
    Conclusion :
    Some C are not A  ✘
    Some B are not D  ✘
    Some A are E        ✘
    All B are D            ✘
    No A is E               ✘
    Some C are A        ✘
    All B are E            ✘
    No B is E              ✘

    ' Either Or ' & ' Neither Nor '

    Complementary Pair

              1. If One Conclusion is positive & One is Negative
                
                No - Some
                Some - Some Not
                All - Some Not
           
           2.  Same Subject & Same Predicate are there
           3.  & not able to draw both the conclusion then answer will be Either Or

    Example

    Statement : All A are B , All A are C , All A are D , No D is E, Some F is C
    Conclusion :-
    syllogism example tricks


    Statement : Some A are B, Some B are C, Some C are D, Some D are E
    syllogism example
    Conclusion
    syllogism example

    Exception
    1. In case of Universal (like 'All & No' ) Conclusion Complementary pair does not work
    2. In this type of Question " Neither Nor "

    Statement Some A are B, All B are C, No C is D
    syllogism shortcut tricks
    Conclusion
            Some A are not D    ✘    
            No B is D                ✘
            Some A are C           ✘
            Some D are B           ✘

    Statement All A are B, No B is C , All C are D
    syllogism shortcut tricks
    Conclusion 
    Some A are not D ✘
         No D is B             ✘
         No A is C             
       No A is D            
       No D is A            ✘

    Possibility

    syllogism shortcut tricks

    Statement Some A are B, Some B are C

    syllogism shortcut
    Conclusion
    syllogism

    Explanation (Simple case A,B & C) :

     Let A, B & C are three person. A & B know each other. B & C know each other But B knows both.Now, Will A talk about C? Answer is 'Not!,Neither Positive Nor Negative' because he doesn't know him.So conclusion C is False.

    Possibility Case (Conclusion : D,E & F) :

    Now Let's take a look at conclusion E.Now Suppose there is raining outside your home and someone comes to you and say there is a possibility to rain today.What would you say to him,'Mad!"The Same scenario is here By looking at diagram it clearly says that Some B are A then how could say it is 'possible' which is actually there.Hence Possibility makes it wrong or false the conclusion.So Conclusion E is wrong.

    Now talk about conclusion F which says Some A are not c which we don't know but it says to let it is a 'possibility' so anything could be possible which doesn't make our statement wrong or contradict with statement.If we make it like this below:
    syllogism
    We talk here about possibility which could be anything which especially not contradict with our statement.So F which was False in Simple Case but When we talk about the possibility is becoming true.
    Let another example for this.Now Let There is a cloudy sky outside your home.Someone comes to you and say ," There is a possibility that there might be rain today", Now you have no idea whether it rain today or not.So you might be say ," Bro! It is possible".Now here you cannot talk about negative because in Syllogism Negative Answer will never be there.

    ssc cgl reasoning syllogism


    In a statement word like these called possibilities
    • Can be 
    • Possible
    • May be / might be
    • Chances
    • Occurs
    • is being a possibility
    • is a possible
    In a statement word like these called sureties
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    29 comments:

    1. In third diagram ,can we say all b are a?

      ReplyDelete
    2. thank u sir

      ReplyDelete
    3. sir please provide some tricks for boat stream, train and mensuration

      ReplyDelete
    4. These topics are lined up for next week

      ReplyDelete
    5. In this Diagram Yes!
      It is true that All B are A

      ReplyDelete
    6. These are possible diagrams for some A are B.In all these diagrams Some is true so we can choose any one diagram while solving possibility.It is false Because in statement like some A is B all the conclusion will wrong like ( All, No)except like ' some & some not ' while solving simple case.

      ReplyDelete
    7. no.. some A are B doesnt imply all B are A


      Some A are B simply implies Some B are A.. so d answer gyvn as false is correct

      ReplyDelete
    8. Thank you so much! super tricks! please provide more exercises! easy as well as critical stage! relay helpful!

      ReplyDelete
    9. In this diagram we can say that
      All A is B [ True ]
      Some A is B [ True ]
      Some B is A [ True ]
      So If statement is this ' Some A is B '
      we can also make this diagram as well because it cannot contradict our statement

      ReplyDelete
    10. Thnx sir
      Sir plz provide short tricks for machine input also

      ReplyDelete
    11. ma'm.. i am sorry to inform u but thn der are some venn diagrams one needs to consider while solving these syllogisms.. i have uploaded d diagrams wid dis comment..


      When in a given premise , only the variables are interchanged , its d case of implication and to solve such qns considering the feasibility and applicability all the venn diagrams i.e our answer must be universally correct..


      In the premise : Some A are B , if we consider all its venn diagrams , then Some B are A is the only possiblity which fits for all cases , rest others donot..


      Actually , my explanation may be rudimentary coz der r some sets of steps I follow , which is too long to write and explain here.. but thn if u can cross-check it from any source which is widout errors, then u may do so..

      ReplyDelete
    12. Thanks a lot 😊 ,sir.

      ReplyDelete
    13. Solanki DharmeshJune 13, 2015 at 5:26 PM

      sir you joying all the student in whatsUP,..THAT'S GOOD HELPING FOR ALL STUDENT ...

      ReplyDelete
    14. Thank u Raman sir

      ReplyDelete
    15. Good Question.
      Like you say Some B are A is only possible .Yup if we follow through all it's diagram but we don't need to do that.we need to follow only Accurate Daigram which is this for some case as in picture . The other possible diagram will help us in question like possibility where we need to find whether the given possibility will became possible without contradicting our statement.Lets take an example Where Statement says All A are B now Here Some B is A can also be true but As you say
      If statement goes like like this All B are A
      then Conclusion Some B or A cannot be possible so it help us to find whether the possible can became true without changing or modifying the statement or question.


      But You are still right about it that this diagram make us confuse in this particular case . So i edited now.

      ReplyDelete
    16. yes.. exactly.. der r 2 cases - conversion and implication..


      conversion is when d variables are variables are interchanged and implication is when variables are not interchanged..


      acc 2 d snap dat u hav uploaded , it says dat Some A are B means Some B are A.. i.e All B are A will be wrong but All A being B is a possiblity is correct

      ReplyDelete
    17. If there Is diagram of All B are A then
      these following conclusion will true
      Conclusion:
      Some A is B [True]
      Some B is A [ True ]
      All A is B [ True ]
      But
      All B is A [ False]
      In All case Some will True

      ReplyDelete
    18. Good work we need this type info.. Keep doing

      ReplyDelete
    19. ma'm.. acc to u , if All B are A is given , then All B is A will be false ?? how ??


      also., if All B are A , then All A are B is false, it shud be Some A are B.. venn diagram says it..

      ReplyDelete
    20. okk okk... thanku ma'm.. plzz do com up wid tricks from machine input and output.. and i am sorry if i became rude to u.. sorry

      ReplyDelete
    21. Priya Mam, I've confusion in conclusion D n E in possibility case.

      ReplyDelete
    22. Dear Sir/ Madam, If statement and conclusion both are same, then what will be the answer? is it true or false.

      ReplyDelete
    23. bt how dat will be true...............All B are A. Statement never be conclusion ...............please explain it

      ReplyDelete
    24. thank u sir..really a superb explanation..sir pdf ke questions chahiye abb

      ReplyDelete
    25. WoWWW!!! super explanation.. for the past two weeks i have been searching about this clear explantion. Now i got it!!! Thank u Raman Sir

      ReplyDelete
    26. All A are B , All A are C , All A are D , No D is E.

      in this case No C is E will be true na... u havementioned false.. plz explain :)

      ReplyDelete

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