Instructions

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

Question 78

36 37 33 42 26 ?

Solution

Squares of natural numbers are alternatively added and subtracted.

36 $$+ 1^2$$ = 37

37 $$- 2^2$$ = 33

33 $$+ 3^2$$ = 42

42 $$- 4^2$$ = 26

26 $$+ 5^2$$ = 51


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