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Q.

In each of the following questions a number series is given. Below the number series a number is given. This number is followed by A, B, C, D and E. Using the same pattern as in the original series answer the questions.

  5,    4,    10,    27,   77,   380

  6     A     B      C     D       E

What will be come in place of D ?

A 395
B 80
C 21
D 8
Answer & Explanation
Option: [B]

The pattern is x 1 - 1, x 2 - 2, x 3 - 3, x 4 - 4, x 5 - 5

So, 6 x 1 - 1 = 5

So, 5 x 2 - 2 = 8

So, 8 x 3 - 3 = 21

So, 21 x 4 - 4 = 80 which replaces D

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