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Machine Input Output - The Easy Way to Solve

Published on Wednesday, November 26, 2014

A very good morning!

Today we are going have a short chat on Reasoning’s most frequent and cheeky topic – Machine Input-Output!

The thing about this topic is – it is easy. That is it! It is EASY.

What is difficult is that – we are LAZY!

Wait up! I have an argument ready!

Betting on Cricket scores – movie box office predictions – share market ups and downs – Bank exam cut-off predictions – are all predicted based on a certain ‘pattern’ – and the ‘pattern’ that we take into consideration to base our prediction pertains to more than 2 samples.

Example – last 5 match’s avg scores in India vs. Pak.

We notice, Virat Kohli is averaging better … then maybe Rohit Sharma …

On the basis of the avg. of those – we predict that in today’s match, Virat will top score, followed by Rohit, Dhawan, Kumar, Dhoni … etc…etc…

What did we do? We identified a pattern – then based on that pattern arranged a new set of elements.

If this we can do – we can do machine input/output sum too – only thing required is interest and determination to solve some 50-100 sums and get the hang of it once and for all!

Then you will not require revising this chapter again and again. Just once in your life – do this chapter, solve as many sums as possible and then don’t them at all except for in exams! And that too – successfully!

With that I rest my case!

Machine Input/Output 101 –

1.      First off - don’t look at an I/O question and skip it! It maybe an easy one.

2.      Look at the Input – see what you are up against. Only words/alphabets or only numbers or alpha-numeric combination.

3.      Then ignore every step and go straight to the last step – now concentrate how they’ve finally arranged the input.

4.      Usually the kind of arrangements we’d find are:
(i) if only numbers – then in ascending or descending.
(ii) words – A-Z or Z-A and as per dictionary! (pop – pope – popped!)
(iii) alpha-numeric – is jumbled in that case you may have all the numbers together in the beginning or at the end, in ascending or descending;
the words in the beginning or at the end, in A-Z or Z-A;
you may have a number and a word in alternating pattern, where - the numbers will ascend or descend – and the words will have their own A-Z/Z-A pattern!

5.      Whatever the pattern is – look at the last step and form an idea in your mind – ‘okay, so numbers first and then the alphabets all in descending/Z-A – fine! Got it!’

6.      Then look at the first step – and identify – how they have started out with the arrangement.

Are they taking a number first? If so highest or lowest number?

Is the number introduced in the step from the front of the sequence or from the last?

Same thing will apply to words too.

7.      You will usually require taking note of 3-4 steps to fully identify the pattern and then you can begin with your own solving. (Don’t waste time copying the steps of the question from the screen! Does anyone do that?)

8.      Note! When you have words arrangement – don’t waste time writing the entire words in your rough sheet – use only the first alphabets, and where there is more than one same first letter, then use the word’s second/third letter to differentiate.


Input : Risk   Crab   Apple   Zombie   Home   Sailor   Rikshaw  
Step 1: Risk   Crab   Apple   Home   Sailor   Rickshaw   Zombie
Step 2: Risk   Crab   Apple   Home   Rickshaw   Sailor   Zombie
and so on …

you can write it as:
Step 1: Ris   C   A   H   S   Ric   Z
Step 2: Ris   C   A   H   Ric   S   Z

9.      For question where they give a separate set of Input for every sub-question and asks you to identify if it is ‘Step III’? – Or, asks you to give the number of steps required to solve a particular input sequence – my sincerest and honest advice is – quickly solve it!

There will be 100% chance of you being correct!

But if you do a mental calculation of the number of inputs arranged in step III and accordingly give your answer – I leave up to you to decide the chances of you getting ‘em wrong!

So – please avoid guesswork!

10.  All the above things that I talked about are applicable if you are able to identify the sequencing/pattern within max 60 seconds – if it is taking more time – go ahead to solve other sums.

But mark it for review so that if time permits you can come back to give ‘em another try!

Must get Full Reasoning ebook

That is all – go identify some patterns!

Good day!

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ramandeep singh

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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