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a(28)-a(23) = 15, then the common differ...

`a_(28)-a_(23) = 15`, then the common difference of the A.P. is

A

3

B

5

C

7

D

15

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The correct Answer is:
A
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VGS PUBLICATION-BRILLIANT-PROGRESSIONS-Creative Bits for CCE Model Examination
  1. The sum of 15 terms of the A.P. 4, 7, 10, ………. Is

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  2. If a(7) - a(3) = 32, then the common difference of the A.P. is

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  3. a(28)-a(23) = 15, then the common difference of the A.P. is

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  4. if a, b,c are in A.P. then b =

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  5. The 17^(th) term of 1.1, 2.2, 3.3, 4.4, ………….. Is

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  6. The 25^(th) term of -300, -290, -280,………. is

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  7. How many numbers are divisible by 4 lying between 101 and 250 ?

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  8. The common ratio of the G.P. 3, 6, 12, 24, ………. Is

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  9. The common ratio of the G.P. 144, 36, 9,………… is

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  10. The 103^(rd) term of 1, -1, 1, -1, ….. is

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  11. Which term of the G.P. 2, 6,18,54,……………… is 2 xx 3^(10)?

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  12. If a(7) + a(4) of a G.P. is 343, then the common ratio is

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  13. If a, b, c are in G.P., then b =

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  14. If 4, x, 9 are in G.P. , then x =

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  15. If 3, x, 11 are in A.P. , then x =

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  16. If x, xy , xy^(2), xy^(3), …………. Forms a G.P., then its 15^(th) term i...

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  17. if a = 3 and a(7) = 33, then a(11) is

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  18. -20, -18, -16, ………… which term of this A.P. is a first positive term?

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  19. 1,-1, 1, -1,1,-1,…… up to 131 terms, then S(131) =

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  20. The 10^(th) term of the AP 3,11,19,…. Is ……….

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