Question : Directions: Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)
Option 1: 16 – 276
Option 2: 21 – 441
Option 3: 23 – 529
Option 4: 19 – 361
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Correct Answer: 16 – 276
Solution : The pattern followed here is that the square of the first number is the second.
Let's check the options –
First option:
16 – 276; 16
2
= 256 ≠ 276
Second option:
21 – 441; 21
2
= 441
Third option:
23 – 529; 23
2
= 529
Fourth option:
19 – 361; 19
2
= 361
So, only the first option does not follow the pattern. Hence, the first option is correct.
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