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Find out the wrong term 3 7 15 39 63 127...

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

Find out the wrong term: 3, 7, 15, 39, 63, 127, 255, 511

Answer & Solution
Correct Answer: Option B
The correct pattern is × 2 + 1.
So, 39 is wrong and must be replaced by (15 × 2 + 1) i.e., 31.
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