Instructions
What will come in place of the question mark (?) in the following series ?
Solution
The pattern followed is :
15 $$+ 2^1$$ = 17
17 $$+ 2^2$$ = 21
21 $$+ 2^3$$ = 29
29 $$+ 2^4$$ = 45
45 $$+ 2^5$$ = 77
77 $$+ 2^6$$ = 141
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