Question

What is the missing number in this sequence? 3,7,15, 63, 127

Answer 1

31

Explanation:

3 times 2 is 6, plus 1 is 7

7 times 2 is 14, plus 1 is 15

15 times 2 is 30, plus 1 is 31

31 times 2 is 62, plus 1 is 63

63 times 2 is 126, plus one is 127

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