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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

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

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.

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