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1. One term in the number series is wrong. Find out the wrong term.
125, 126, 124, 127, 123, 129
So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.
125, 126, 124, 127, 123, 129
Solution:
The correct pattern is + 1, - 2, + 3, - 4, + 5.So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.