Instructions

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

Question 173

1, 121, 441, 961, 1681, ?

Solution

The pattern here followed is :

$$1^2$$ = 1

$$11^2$$ = 121

$$21^2$$ = 441

$$31^2$$ = 961

$$41^2$$ = 1681

$$51^2$$ = 2601

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