In each of the following questions, a number series is given. After the series, below it, a number followed by (a), (b), (c) and (d) is given. You have to complete the series following the same sequence as that of given series. Then answer the question that follows.
If the series 3,7,15,31 ......... and 2,a,b,c,d ........ follow the same logic, what will come in the place of (d) ?
Here, the pattern is
7 = 2(3)+1
15 = 2(7)+1
31= 2(15)+1
Similarly,
a = 2(2)+1 = 5
b = 2(5)+1 = 11
c = 2(11)+1 =23
d = 2(23)+1 =47
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