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If the sum of the first 9 terms of an AP...

If the sum of the first 9 terms of an AP is equal to the sum of its first 11 terms, then find the sum of its irst 20 terms.

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If the sum of the first 9 terms of an AP is equal to the sum of its first 11 terms, then find the sum of its first 20 terms.

If the sum of the first 9 terms of an AP is equal to the sum of its first 11 terms, then find the sum of its first 20 terms.

If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p+q) terms.

If the sum of first p terms of an A.P.is equal to the sum of the first q terms,then find the sum of the first (p+q) terms.

If the sum of the first 9 terms of an A.P. is 81 and that of the first 18 terms is 324, find the sum of its first n terms.

If the sum of first 10 terms of an A.P is 60 and sum of first 15 terms is -165 then find the sum of its n terms

The 12th term of an AP is -13 and the sum of its first four terms is 24. Find the sum of its first 10 terms.

If sum of first 6 terms of an AP is 36 and that of the first 16 terms is 256 , then find the sum of first 10 terms.

If sum of first 20 terms of an A.P. is equal to sum of first 30 terms of the A.P. then sum of the first 50 terms of the A.P. is

AGRAWAL PUBLICATION-ARITHMETIC PROGRESSIONS-EXAMPLE
  1. Find how many integers between 200 and 500 are divisible by 8.

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  2. Determine the AP whose third term is 5 and the seventh term is 9.

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  3. If the sum of the first 9 terms of an AP is equal to the sum of its fi...

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  4. Find the number of natural numbers between 102 and 998 whixh are divis...

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  5. For what value of n, are the n^(th) terms of two A.Ps 63,65,67… and 3,...

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  6. The common difference between the terms of two AP's is same. If the di...

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  7. In an AP, if Sn + S7 =167 and S(10) =235, then find th AP, where Sn de...

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  8. The 4^(th) erm of an AP. Is zero. Prove that the 25th term of the A.P ...

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  9. For an AP,it is given that the first term (a) = 5, common difference (...

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  10. If 6 times the 6^(th) term of an AP. Is equal to 9 times the 9^(th) te...

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  11. Find the sum of all 11 terms of an A.P. whose middles term is 30.

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  12. Find the sum first 15 multiples of 8.

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  13. Two AP's have the same common difference.The diference their between t...

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  14. Justify whether it is true to say that the following are the n^(th) te...

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  15. Justify whether it is true to say that the following are the n^(th) te...

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  16. Justify whether it is true to say that the following are the n^(th) te...

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  17. Find a, b, and c such that the following numbers in AP: a,7, b, 23, c.

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  18. Determin the AP whose 5^(th) term is 19 and the difference of 8^(th) t...

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  19. Th sum of the first 30 terms of an A.P I 1920. If the fourth term is 1...

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  20. Which term of the A.P 20, 19 1/4 , 18 1/4, 17 1/4, ….. is the first ne...

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