One term in the number series is wrong. Find out the wrong term. 125, 126, 124,

Question

One term in the number series is wrong. Find out the wrong term.
125, 126, 124, 127, 123, 129

Options:

A . 126

B . 124

C . 123

D . 129

Answer: Option D
The correct pattern is + 1, - 2, + 3, - 4, + 5.
So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.

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