Instructions

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

Question 71

11 9 15 41 159 ?

Solution

The pattern followed is :

11 $$\times 1 - 2$$ = 9

9 $$\times 2 - 3$$ = 15

15 $$\times 3 - 4$$ = 41

41 $$\times 4 - 5$$ = 159

159 $$\times 5 - 6$$ = 789

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