What will come in place of the question mark (?) in the given number series?
19 20 16 25 9 ?
Squares of natural numbers are alternatively added and subtracted.
19 $$+ 1^2$$ = 20
20 $$- 2^2$$ = 16
16 $$+ 3^2$$ = 25
25 $$- 4^2$$ = 9
9 $$+ 5^2$$ = 34
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