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    Select the alphanumeric clusters from among the given options that can replace the question mark (?) in the following series.z1, x4, v9, t16, ?
    Question

    Select the alphanumeric clusters from among the given options that can replace the question mark (?) in the following series.
    z1, x4, v9, t16, ?

    A.

    t26

    B.

    v25

    C.

    s24

    D.

    r25

    Correct option is D

    Given: z1, x4, v9, t16, ?
    Logic: Letters are decreasing - 2 place and numbers are perfect square of natural numbers.
    ​z - 2 = x, 1 = 12
    x - 2 = v, 4 = 22
    v - 2 = t, 9 = 32
    t - 2 = r, 16 = 42​
    Next perfect square is: 52= 25
    Next term is r25.
    Thus, correct option is (d).

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