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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