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An A.P. consists of 23 terms. If the sum...

An A.P. consists of 23 terms. If the sum of the three terms Is the middle is 141 and the sum of the last three terms is 261, then the first is

A

6

B

5

C

4

D

3

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The correct Answer is:
D
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NEW JOYTHI PUBLICATION-SEQUENCES AND SERIES -QUESTIONS FROM COMPETITIVE EXAMS
  1. If the sum to first n terms of the A.P. 2, 4, 6, …. is 240, then the v...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. If a(1) = 4 and a(n + 1) = a(n) + 4n for n gt= 1, then the value of a(...

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  20. If the first term of a G.P. is 729 and its 7^(th) term is 64, then the...

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