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Find out the wrong term 1 3 10 21 64 129...

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
?

Find out the wrong term: 1, 3, 10, 21, 64, 129, 356, 777

Answer & Solution
Correct Answer: Option D
The correct pattern is × 2 + 1, × 3 + 1, × 2 + 1, × 3 + 1,...........
So, 356 is wrong and must be replaced by (129 × 3 + 1) i.e., 388.
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