Question 30

Select the correct option that will complete the series.
15, 31, ?, 127, 255

Solution

$$15\times\ 2+1 = 30+1 = 31$$

$$31\times\ 2+1 = 62+1 = 63$$

$$63\times\ 2+1 = 126+1 = 127$$

$$127\times\ 2+1 = 254+1 = 255$$

Here 63 will come in place of question mark.

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