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If the sum to first n terms of the A.P. ...

If the sum to first `n` terms of the A.P. `2, 4, 6, ….` is 240, then the value of `n` is

A

14

B

15

C

16

D

17

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The correct Answer is:
B
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NEW JOYTHI PUBLICATION-SEQUENCES AND SERIES -QUESTIONS FROM COMPETITIVE EXAMS
  1. If a(1), a(2), ……., a(n) are in A.P. with common differece d != 0, the...

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  2. Let a be a positive number such that the arithmetic mean of a and 2 e...

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  3. If the sum to first n terms of the A.P. 2, 4, 6, …. is 240, then the v...

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  4. The value of 1/(sqrt(10) - sqrt(9)) - 1/(sqrt(11) - sqrt(10)) + 1/(sqr...

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  5. An A.P. consists of 23 terms. If the sum of the three terms Is the mid...

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  6. If a(1), a(2), a(3), ......... , are in A.P. with common difference 5 ...

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  7. The sum of all two digit natural numbers which leave a remainder 5 whe...

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  8. If the 9^(th) term of A.P. is zero, then the ratio of 29^(th) term to ...

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  9. Let S(1), S(2), ...... S(101) be consecutive terms of A.P. If 1/(S(1)S...

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  10. If a(1), a(2), a(3), ……. , a(n) are in A.P. and a(1) = 0, then the val...

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  11. The value of 1^(2) - 2^(2) + 3^(2) - 4^(2) + ….. + 11^(2) is equal to

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  12. Let s(n) denote the sum of first n terms of an A.P. and S(2n) = 3S(n)....

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  13. The first four terms of an A.P. are a, 9, 3a - b, 3a + b. The 2011^(th...

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  14. If log(e)5,log(e)(5^(x) - 1) and log(e)(5^(x) - 11/5) are in A.P., th...

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  15. The sum to n terms of the series 4/3 + 10/9 + 28/27 + ……. is

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  16. If sum(k = 1)^(n) k (k + 1)(k - 1) = pn^(4) + qn^(3) + tn^(2) + sn whe...

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  17. In an A.P., the first term is 2 and the sum of first five terms is 5. ...

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  18. If a, b, c, d are in G.P., then (a + b + c + d)^(2) is equal to

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  19. The sum of first n terms of the series 1 + (1 + x) y+ (1 + x + x^(2)) ...

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  20. If 3^(rd), 7^(th) and 12^(th) terms of A.P. are three consecutive term...

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