Instructions

What will come in place of the question mark (?) in the following series ?

Question 125

15    17    21     29     45     77 ?

Solution

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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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