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If the sum of first 8 terms of an Arithm...

If the sum of first 8 terms of an Arithmetic progression is 136 and that of first 15 terms is 465, then find the sum of first 25 terms.
OR
Ths sum of the 5th and 9th terms of an A.P. is 40 and the sum of the 8th and 14th term is 64. Find the sum of the first 20 terms.

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