Select the correct option that will complete the series.
15, 31, ?, 127, 255
$$15\times\ 2+1 = 30+1 = 31$$
$$31\times\ 2+1 = 62+1 = 63$$
$$63\times\ 2+1 = 126+1 = 127$$
$$127\times\ 2+1 = 254+1 = 255$$
Here 63 will come in place of question mark.
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