Instructions

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

Question 47

19 20 16 25 9 ?

Solution

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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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