1.

7, 15, 32, ?, 138, 2811). 652). 673). 664). 57

Answer»

The pattern of the given series is as follows:

⇒ 15 = 7 × 2 + 1

32 = 15 × 2 + 2

⇒ 67 = 32 × 2 + 3

⇒ 138 = 67 × 2 + 4

281 = 138 × 2 + 5


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