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What should come in place of question mark (?) in the following number series ?
1, 121, 441, 961, 1681, ?
2701
2511
2611
2801
None of these
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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