What will come in place of question mark (?) in the given number series?
36 37 33 42 26 ?
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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