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Find the missing number 3 7 15 63 127

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
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Find the missing number: 3, 7, 15 ,?, 63 ,127

Answer & Solution
Correct Answer: Option B
Each number in the series is one more than twice the preceding number.
So, the missing term = (15 x 2) + 1 = 31
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