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Machine Input Output - Technique to Solve

Published on Wednesday, September 30, 2015
Machine Input Output is an important chapter for IBPS exams. Most of the students don't know about the right approach to solve these questions. Today, I am providing the right approach for solving the Machine Input Output questions in the exams. Read shortcut trick for this chapter here.

input output problems
  • Machine Input/Output is scoring chapter in Quant because if once you understand the pattern, your all answers will be correct. As we know, there are many type of patterns in which questions are arranged. We have to understand that patterns and solve our questions.
  • If you trying to solve these questions through traditional way that means you are wasting your time. Here are some shortcut tricks which can help you solving the questions quickly and saves your precious time during competitive exams.

         Different Types of Questions  Used in Questions

       1st Type of Questions

  • How many steps are required to complete the following arrangement 

       2nd Type of Question

  • When particular step is given in the question and you have to find the last step or any other step (i.e. find the fourth or fifth or third step)

        3rd Type of Question

  • Output is given and you have to find the Input
 (If question is asked that Output is given and find the Input, your answer always should have None of These )

       4th Type of Question

  • Which one will be the final arrangement?

       5th Type of Question

  • Which step will be last but one step
("Last but one step" means Second Last Step)


  • Always remember, First Step is to observe Last Step.
  • Last step in the question say much about that particular question. First of all, while solving the question last step should always be in consideration. 
Lets understand all these thoroughly through some questions.


Input:         but         32         71       glory          fair          south          65        84
Step I:       south     but         32        71              glory         fair            65        84  
Step II:     south      84          but       32               71            glory        fair       65 
Step III:    south      84        glory      but            32             71             fair       65
Step IV:     south      84       glory       71           but             32            fair         65   
Step V:       south      84       glory       71           fair           but            32           65  
Step VI:      south     84        glory      71            fair           65              but         32
In the above question it carries six steps that does not means all questions will contain same steps.
  • To solve the question we have to understand the logic behind above rearrangements  and to understand the logic observes the last step first.
  • If we see the output the order is first of all  Alphabets comes then numbers, again alphabets and then again numbers and so on.
  • Alphabets are in the decreasing order (reverse order)  means alphabets are arranged in dictionary manner like Z to A. that is south, glory, fair and but in Output.
  • In the Output, Numbers are in decreasing order such as 84, 71, 65 and 32.
  • From the output, we can understand each step ahead.In the Output, south comes first that means in the first step they brought forward south and other numerical/alphabetical values remain same
  • Now again comes to Output. After the word south, you can see 84. It means in Step II, 84 move. You can easily observes that in Step II, 84 brought forward after south and other values remain same.
  • Then in Step III, glory comes forward after 84 and other values remaining same.
  • In Step IV, 71 comes forward after glory and other values remaining same.
  • In Step V, fair comes forward after 71.
  • In Last Step, 65 after fair and other values remaining same.
  • As a result of above arrangements, we easily found the pattern of output. 
Now we have to answer the questions;

Q1.      Input:      any     hen    49     24      far      wide      34       69   
Find the output.

    Step I:              wide    any    hen   49      24        far          34      69
    Step II:             wide   69      any    hen    49        24         far      34
    Step III:            wide   69     hen     any    49        24         far      34
    Step IV:           wide    69    hen     49      any       24         far      34
    Step V:            wide   69     hen      49       far       any      24      34
    Step VI:           wide    69    hen      49      far       34         any     24

  • It will consume much time. You don't have any need to write. Just from the output in question solve accordingly by this you can save your precious time during exam.

Q2. After how many steps you can get output?
Answer:  We don't have any need to solve step by step. Simply after observing the output we can give the answer of steps like diagram below

  • Take one common point. Wide brought forward then numerical value 69 and so on as we see the pattern earlier. any and 24 does not show with arrows because they are automatically in their proper place after 34 brought forward.
  • Number of Arrows = Number of Steps

Q3. How many more steps are required to complete the arrangement given below:
         year          92        ultra      15        23         string       house     39

  •  year      92        ultra     (these are already in arranged manner).
  • Now take help of arrows
  • Number of arrows are 4 that means 4 steps more required to complete the arrangement according to output.

Q4. What will be Third step  if:- 
Input:    play        over        49          37       12      match       now      81

a)    play     81      over     49      37      match        now       12
b)    play     81      over      49     37        12            now       match
c)    play     81      over      49     now      37            match      12
d)   There will be no such step

  • Put 81 forward and cross  its previous position then over and 49 is already in its right positions so no further cancellation. Now brings forward and cross its previous position. 37  is in its right position then Match brings forward  and cancel its previous position. No further cancellation because 12 is automatically at the end. Number of crosses on diagram shows the number of steps. 
  • 3 crosses are on the diagram that means 3 steps are done and answer is Option C.

Q5. What will be the 'definite' input if
Step II:     Town     74    pair    15   31     nice      job    42

  • Answer of this question will be Can not be determined because position of 74 can not be determined in step I, it may be after pair, after 15 after 31 and so on. But question is asked about definite input which is impossible. If he ask about possible input then we can take guess but now the case is definite input so answer will be Can Not be Determined.
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Ramandeep Singh, your guide to banking and insurance exams. With 14 years of experience and 5000+ selections, Ramandeep understands the path to success, having transitioned himself from Dena Bank and SBI. He's passionate about helping you achieve your banking and insurance dreams.

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