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    Question

    Three of the following four triads are alike in a

    certain way as they are formed by performing same mathematical operations among themselves and thus form a group. Which triad does NOT belong to that group?
    A 11 : 21 : 121 Correct Answer Incorrect Answer
    B 7 : 15 : 49 Correct Answer Incorrect Answer
    C 2 : 3 : 4 Correct Answer Incorrect Answer
    D 9 : 17 : 81 Correct Answer Incorrect Answer

    Solution

    Logic: (first number) : (Second number) : (Third number) (first number) : (Double of first number -1) : ( Square of the first number)

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