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If the sum of first 8 terms of arithmeti...

If the sum of first 8 terms of arithmetic progressions is 136 and that of first 15 terms is 465, then find the sum of first 25 terms.
OR
The sum of the `5^(th) and 9^(th)` terms of an arithmetic progression is 40 and the sum of the `8^(th)` and `14^(th)` term is 64, find the sum of first 20 terms.

Text Solution

Verified by Experts

The correct Answer is:
`S_(25)=1275`
OR
610
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