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Find the sum of n terms of an A.P. whose...

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

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The correct Answer is:
`n^(2)+2n`
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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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