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The sum of first m terms of an A.P...

The sum of first `m` terms of an A.P. is `4m^2-m` . If its `n t h` term is 107, find the value of `n` . Also, find the `21 s t` term of this A.P.

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
  1. The sum of first n terms of an A.P. is 5n^2+3n If its mth term is 168,...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  18. Define an arithmetic progression.

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  19. Write the common difference of an A.P. whose n t h term is an=3n+7 ...

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  20. Which term of the sequence 114 ,\ 109 ,\ 104 ,\ is the first ne...

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