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If the sum of first term of an A.P is 4...

If the sum of first term of an A.P is 49 and that of 17 terms is 289. Find the sum of first "n" terms.
OR
The sum of the third and seyenth terms of an AP is 6 and their product is 8. find the sum of first sixteen terms of the A.P.

Text Solution

Verified by Experts

The correct Answer is:
`Sn=n^(2)`
OR
`:.S_(16)=20`
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