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If the sum of first 7 terms of an AP is ...

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

A

`n^2`

B

`n^3`

C

`n^2 + 1`

D

`n^3 - 1`

Text Solution

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The correct Answer is:
A
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