Question
Four number-pairs have been given, out of which three
are alike in some manner and one is different. Select the number-pair that is different.Solution
The logic followed here is: In all of the above number pairs, the second number is the square of the first number, except for one pair. 15 × 15 = 225
18 × 18 = 324
21 × 21 ≠420
12 × 12 = 144
17 × 17 = 289
The number pair (21 - 420) does not follow the pattern.
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