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    Question

    Four number-pairs are given, which of them three are

    alike in certain manner and one is different. Choose the different number-pair.
    A 81: 6561 Correct Answer Incorrect Answer
    B 16: 256 Correct Answer Incorrect Answer
    C 121: 14641 Correct Answer Incorrect Answer
    D 4: 18 Correct Answer Incorrect Answer

    Solution

    The pattern followed here is: First number is (x)² and second number is (x)⁴. 81: 6561 → (9)² = 81 (9)⁴ = 6561 16: 256→ (4)² = 16 (4)⁴ = 256 121: 14641→ (11)² = 121 (9)⁴ = 14641 4: 16→ (2)² = 4 (2)⁴ = 16 

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