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1. One term in the number series is wrong. Find out the wrong term.
1, 5, 5, 9, 7, 11, 11, 15, 12, 17
I. 1, 5, 7, 11, 12 and II. 5, 9, 11, 15, 17
The pattern in both I and II is + 4, + 2, + 4, + 2. So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.
1, 5, 5, 9, 7, 11, 11, 15, 12, 17
Solution:
The given sequence is a combination of two series:I. 1, 5, 7, 11, 12 and II. 5, 9, 11, 15, 17
The pattern in both I and II is + 4, + 2, + 4, + 2. So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.