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Let s(n) be the sum of the first n terms...

Let `s_(n)` be the sum of the first n terms of an AP. If `S_(2n)=3n+14n^(2)`, then what is the common difference ?

A

1

B

2

C

4

D

3

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The correct Answer is:
B
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PUNEET DOGRA-SEQUENCE AND SERIES-PREVIOUS YEAR QUESTIONS
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  2. If 1/4, 1/x and 1/10 are in HP, then what is the value of x ?

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  3. If the sequence {S(n)} is a geometric progression and S(2)S(11)=S(p)S(...

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  7. The sum of first 10 terms and 20 terms of an AP are 120 and 440, respe...

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  8. Let s(n) be the sum of the first n terms of an AP. If S(2n)=3n+14n^(2)...

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  9. The sum of first 10 terms and 20 terms of an AP are 120 and 440, respe...

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  10. Number of terms common in the first 100 terms of the arithmetic progre...

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  11. If a, b, c, d, e, f are in A.P., then e – c is equal to

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  12. If the 10th term of a GP is 9 and 4^(th) term is 4, then what is its 7...

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  13. (1)/(b-a)+(1)/(b-c)=(1)/(a)+(1)/(c) then a,b,c are in:

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  14. A square is drawn by joining mid-points of the sides of a square. Anot...

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  15. If the A.M. and G.M. between two numbers are in the ratio m.n., then w...

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  16. The sum of an infinite geometric progression is 6. if the sum of the f...

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  18. let a,b,c be in an A.P. consider the following statements: I. (1)/(a...

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