Instructions

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

Question 69

10 11 15 24 40 ?

Solution

Squares of natural numbers are added.

10 $$+ 1^2$$ = 11

11 $$+ 2^2$$ = 15

15 $$+ 3^2$$ = 24

24 $$+ 4^2$$ = 40

40 $$+ 5^2$$ = 65

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