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The sum of first n terms of an A.P. is 5...

The sum of first n terms of an A.P. is `5n^2+3n` If its mth term is 168, (i) Find the value of m (ii) Find the 20th term of this AP

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RD SHARMA-ARITHMETIC PROGRESSIONS-All Questions
  1. In an AP, the sum of first ten terms is -150 and the sum of its next t...

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  2. Sum of the first 14 terms of an AP is 1505 and its first term is 10. F...

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  3. The sum of first n terms of an A.P. is 5n^2+3n If its mth term is 168,...

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  4. The sum of first q terms of an A.P. is 63 q-3q^2 . If its p t h ...

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  5. The sum of first m terms of an A.P. is 4m^2-m . If its n t h ter...

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  6. the A.P. nth term of an A.P. is given by (-4n + 15). Find the sum of f...

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  7. Find the number of terms of the A.P. -12 ,\ -9,\ -6,\ dot,\ 12 . If...

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  8. The sum of first n terms of an A.P. is 3n^2+4n . Find the 25 t h...

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  9. The sum of first seven terms of an A.P is 182. If its 4(th) term and 7...

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  10. The sum of the first n terms of an A.P. is 3n^2+6n . Find the n ...

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  11. The sum of the first 7 terms of an AP is 63 and the sum of its next 7 ...

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  12. If Sn denotes the sum of the first n terms of an A.P., prove tha...

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  13. The sum of first n terms of an A.P. is 5n-n^2 . Find the n t h t...

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  14. The sum of the first n terms of an A.P. is 4n^2+2n . Find the n ...

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  15. If the 10 t h term of an A.P. is 21 and the sum of its first ten te...

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  16. The first and the last terms of an AP are 7 and 49 respectively. If...

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  17. If Sn denotes the sum of first n terms of an A.P., prove that S(...

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  18. If the sum of the first n terms of an A.P. is 1/2(3n^2+7n), then find ...

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  19. The sum of first 9 terms of an A.P. is 162. The ratio of its 6th t...

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  20. Define an arithmetic progression.

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