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Question 37
Select the number that can replace the question mark (?) in the following series.
3, 7, 15, 31, 63,?
Solution
$$3\times2+1 = 6+1 = 7$$
$$7\times2+1 = 14+1 = 15$$
$$15\times2+1 = 30+1 = 31$$
$$31\times2+1 = 62+1 = 63$$
$$63\times2+1 = 126+1 = 127$$
Hence 127 will come in place of question mark.
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