Practice Test Discussion

Q)

In series 1, only one number is wrong. If the wrong number is corrected, the series gets established following a certain logic. Complete series 2 with same logic and answer the given question.

Series 1: 1 3 7 11 21 43 85
Series 2: 4 a b c d e f

What will come in place of (f) ?

    • Explanation

    The given number series 1 follows the logic,

    ⇒ 1×2+1= 3

    ⇒ 3×2-1= 5

    ⇒ 5×2+1= 11

    ⇒ 11×2-1= 21

    ⇒ 21×2+1= 43

    ⇒ 43×2-1= 85

    Similarly , series 2

    ⇒ 4×2+1= 9

    ⇒ 9×2-1= 17

    ⇒ 17×2+1= 35

    ⇒ 35×2-1= 69

    ⇒ 69×2+1= 139

    ⇒ 139×2-1= 2770

    Hence, Option C is correct

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