In following questions, one term in number series is incorrect.
Find out the incorrect number 1, 3, 10, 21, 64, 129, 256, 778
Option:
A. 10
B. 21
C. 129
D. 256
Answer: D . 256
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Justification:
The sequnece is * 2 + 1, * 3 + 1, * 2 + 1, * 3 + 1,....
So, 256 is wrong and must be replaced by (129 * 2 + 1) i.e. 259.
