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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 25: 425 Correct Answer Incorrect Answer
    B 15: 285 Correct Answer Incorrect Answer
    C 21: 231 Correct Answer Incorrect Answer
    D 24: 144 Correct Answer Incorrect Answer

    Solution

    In all the pairs, second number is prime multiple of first number except for [24: 144]. In 25: 425 тЖТ 425 ├╖ 25 = 17 In 15: 285 тЖТ 285 ├╖ 15 = 19 In 21: 231 тЖТ 231 ├╖ 21 = 11 But in 24: 144 тЖТ 144 ├╖ 24 = 6

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