Find the wrong term in the following number series? 1, 4, 8, 16, 31, 64, 127, 256

Find the wrong term in the following number series?

1, 4, 8, 16, 31, 64, 127, 256

The pattern of the given number series is as:

→ 1,            

→ 1 × 2 + 2 = 4,

→ 4 × 2 – 1 = 7, (instead of 8)

→ 7 × 2 + 2 = 16,

→ 16 × 2 – 1 = 31,

→ 31 × 2 + 2 = 64,

→ 64 × 2 – 1 = 127,

→ 127 × 2 + 2 = 256,

Hence, the wrong term of the given number series is 8. The correct term is 7.

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