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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.

Text Solution

Verified by Experts

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

The sum of the 4th and 8th terms of an AP is 24 and the sum of the 6th and 10th terms is 44. Find the first three terms of the AP.

Knowledge Check

  • 7th term of an A.P. is 40. then the sum of the first 13 terms is

    A
    520
    B
    53
    C
    2080
    D
    1040

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