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If the sum of first 7 terms of an AP is ...

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

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The correct Answer is:
`n^(2)`
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If the sum of 7 terms of an A.P. is 49 and that of 17 terms is 289, find the sum of n terms.

The sum of first 7 terms of an A.P. is 49 and that of first 17 terms of it is 289. Find the sum of first n terms.

The sum of first 8 terms of an A.P. is 64 and that of first 15 terms is 225. Find the sum of its first 17 terms.

The sum of 8 terms of an A.P. is 64 and sum of 17 terms is 289. Find the sum of its 'n' 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 6 terms of an AP is 36 and that of the first 16 terms is 256 , then find the sum of first 10 terms.

The sum of first 7 terms of an A.P. is 10 and that of next 7 terms is 17. Find the progression.

The sum of first p- terms terms of an A.P. is q and the sum of first q terms is p, find the sum of first (p + q)

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NAGEEN PRAKASHAN ENGLISH-ARITHMETIC PROGRESSION-Exercise 5c
  1. Find the value of 'x' if 1+6+11+...+x=189

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  2. (a) Find the sum of first 200 even natural numbers. (b) Find the sum...

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  3. Find the sum of n terms of an A.P. whose nth term is (2n+1).

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  4. The sum of n terms of a series is n(n+1) . Prove that it is an A.P. al...

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  5. The sum of n terms of a series is (3n^(2)+2n). Prove that it is an A.P...

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  6. The sum of first 5 terms and first 15 terms of an A.P. are equal. Fin...

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  7. The sum of first 8 terms and first 24 terms of an A.P. are equal. Find...

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  8. The sum of15 terms of an A.P. is zero and its 4th term is 12. Find its...

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  9. The sum of first 8 terms of an A.P. is 64 and that of first 15 terms i...

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  10. If the m^(t h) term of an A.P. is 1/n and the n^(t h) terms is 1/m , s...

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  11. If a(1), a(2), a(3) , … are in A.P. , such that a(1) + a(5) +a(10) ...

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  12. The first term, last term and common difference of an A.P. are respect...

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  13. If S(n) denotes the sum of first n terms of an AP, then prove that S(1...

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  14. Yasmeen saves Rs. 32 during the first month, Rs. 36 in the second mont...

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  15. The sum of the first five terms of an AP and the sum of the first seve...

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  16. 200 logs are stacked in the following manner: 20 logs in the bottom ...

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  17. The ratio of the sum of n terms of two A.P. s is (7n+1):(4n+27) . Fin...

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  18. If the sum of first 7 terms of an AP is 49 and that of 17 terms is ...

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  19. The famous mathematician associated with finding the sum of the first ...

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  20. If S1 is the sum of an arithmetic progression of ' n ' odd number ...

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