Instructions

What should come in place of the question mark (?) in the following number series?

Question 135

1, 9, 25, 49, 81, ?, 169

Solution

The series is square of consecutive odd numbers

$$1^2$$ = 1

$$3^2$$ = 9

$$5^2$$ = 25

$$7^2$$ = 49

$$9^2$$ = 81

$$11^2$$ = 121

$$13^2$$ = 169

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