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      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.
      A 15 - 225 Correct Answer Incorrect Answer
      B 18 - 324 Correct Answer Incorrect Answer
      C 21 - 420 Correct Answer Incorrect Answer
      D 12 - 144 Correct Answer Incorrect Answer
      E 17 - 289 Correct Answer Incorrect Answer

      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 Γ— 15 = 225

      18 Γ— 18 = 324

      21 Γ— 21 β‰  420

      12 Γ— 12 = 144

      17 Γ— 17 = 289

      The number pair (21 - 420) does not follow the pattern.

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