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Find the sum to 20 terms of the AP 10,...

Find the sum to
20 terms of the AP 10,7,4,……

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MAXIMUM PUBLICATION-SEQUENCE AND SERIES-EXAMPLE
  1. A sequence is given {an} by an=n^2-1, n in N show that it is not an AP...

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  2. Find the sum to 15 terms of the AP 3,7,11,……

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  3. Find the sum to 20 terms of the AP 10,7,4,……

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  4. Find the sum to 81 terms of the AP-1, 1/4,3/2,……

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  5. Insert 6 arithmetic means between 3 and 24.

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  6. If the n^th term of a GP -2,4,-8,,16,…… is 1024. Find n.

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  7. If the n^th term of a GP 2,2sqrt2,4,…… is 64. Find n.

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  8. Find the sum of first 20 terms of the GP sqrt3,2sqrt3,4sqrt3,8sqrt3,...

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  9. In a GP {an}, if a1=3,an=96 and Sn=189. Find common ration and n.

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  10. Find the sum to n terms of the question: 9+99+999+…..

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  11. Find the sum to n terms of the question: 4+44+444+…..

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  12. The third term of a GP is 4. Find the product of the first five terms.

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  13. Insert 4 geometric means between 4 and 972.

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  14. Find the sum to infinity of this geometric progression. 1,1/2,1/2^2,...

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  15. Find the sum to infinity of this geometric progression. 5,20/7,80/49...

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  16. The 10^th term of an AP is 73 and the 20^thterm is 43. Find the 44^th ...

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  17. The 7^th term of an AP is 34 and the 15^thterm is 74. Find the 40^th t...

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  18. Find the sum of 32 terms of an AP whose third term is 1 and the 6^th t...

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  19. Find the sum to n terms of a series is 7n^2-5n. Show that it is an AP ...

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  20. Find three numbers in AP whose sum is -3 and whose product is 8.

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