Complete the series.
1, 3, 7, 15, 31, (…)
1, 3, 7, 15, 31, (…)
all the nos. are multiplied by 2 and added by 1
$$1\times 2 + 1=3$$
$$3\times 2 + 1=7$$
$$7\times 2 + 1=15$$
$$15\times 2 + 1=31$$
so next
$$31\times 2 + 1=63$$
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