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What should come in place of '?' in the given series?13, 34, 76, 160, 328, ?
Question

What should come in place of '?' in the given series?
13, 34, 76, 160, 328, ?

A.

625

B.

664

C.

672

D.

638

Correct option is B

Given:
13, 34, 76, 160, 328, ?
Logic: the difference is multiplied by 2 each time:
13 + 21 = 34 (Initial difference is 21)
34 + 42 = 76 (The difference 21 is multiplied by 2: 21 × 2 = 42)
76 + 84 = 160 (The difference 42 is multiplied by 2: 42 × 2 = 84)
160 + 168 = 328 (The difference 84 is multiplied by 2: 84 × 2 = 168)
328 + 336 = 664 (The difference 168 is multiplied by 2: 168 × 2 = 336)
Thus, the next number in the series is 664,
Correct answer is (b) 664.

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