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given: a3=15,S[10]=125, find d and a[10]...

given: `a_3=15`,`S_[10]=125`, find d and `a_[10]`

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In an A.P. : (i) given a=5, d=3, a_(n)=50 , find n and S_(n) . (ii) given a=2, d=8, S_(n)=90 , find n and a_(n) . (iii) given a=3, n=8, S_(n)=192 , find d. (iv) given l=28, S=144, n=9 , find a.

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OSWAL PUBLICATION-ARITHMETIC PROGRESSIONS -NCERT CORNER (EXERCISE-5.3)
  1. In an A. P. : given a = 7, a (13)= 35, find d and S (13)

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  2. In an A. P. : given a (12) = 37, d = 3, find a and S (12).

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  3. given: a3=15,S[10]=125, find d and a[10]

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  4. given d = 5, S9 = 75, find a and a9.

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  5. In an A. P. : given a = 2, d = 8, S (n) = 90, find n and a (n)

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  6. In an A. P. : given a = 8, a (n) = 62, S (n) = 210, find n and d.

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  7. In an AP, given an=4, d=2, Sn=-14 find n and a

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  8. In an A. P. : given a = 3, n = 8, S = 192, find d.

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  9. In an A. P. : given l = 28, S = 144, and there are total 9 terms Fin...

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  10. How many terms of the AP: 9, 17, 25, . . . must be taken to give a sum...

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  11. The first term of an A.P. is 5, the last term is 45 and the sum is 400...

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  12. The first and the last terms of an A.P. are 17 and 350 respectively. I...

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  13. Find the sum of first 22 terms of an A.P. in which d = 7 and 22 nd ter...

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  14. Find the sum of first 51 terms of an A.P. whose second and third terms...

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  15. If the sum of first 7 terms of an A.P. is 49 and that of 17 terms is 2...

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  16. Show that a (1), a (2), …., a (n),… from an A.P. where a (n) is define...

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  17. Show that a (1), a (2), …., a (n),… from an A.P. where a (n) is define...

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  18. If the sum of the first n terms of an A.P. is 4n - n ^(2), what is the...

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  19. The sum of first 40 positive integers divisible by 6 is

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  20. Find the sum of the first 15 multiples of 8.

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