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Let Sn denote the sum of the first n ter...

Let `S_n` denote the sum of the first n terms of an AP
`S_(2n)=3S_n` Then the ratio `S_(3n)/S_n` is equal to

A

`2:1`

B

`3:1`

C

`4:1`

D

`5:1`

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The correct Answer is:
A
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PUNEET DOGRA-SEQUENCE AND SERIES-PREVIOUS YEAR QUESTIONS
  1. The sum of the series formed by the sequence 3, sqrt3, 1, . . . Upto i...

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  2. Let S(n) denotes the sum of first n terms of an AP and 3S(n)=S(2n). ...

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  3. Let Sn denote the sum of the first n terms of an AP S(2n)=3Sn Then t...

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  4. Let f(x)=ax^(2)+bx+c such that f(1)=f(-1) and a,b,c are in Arithmetic ...

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  5. Let f(x)=ax^(2)+bx+c such that f(1)=f(-1) and a,b,c are in Arithmetic ...

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  6. Let f(x)=ax^(2)+bx+c such that f(1)=f(-1) and a,b,c are in Arithmetic ...

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  7. If the numbers n-3,4n-2,5n+1 are in AP, what is the value of n? (a)1 ...

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  8. What is the seventh term of the sequence 0,3,8,15,24 ?

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  9. The sum of the first five terms and the sum of the first ten terms of ...

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  10. What is 0.9+0.09+0.009+ . . . Equal to ?

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  11. If the positive integers a,b,c and d are in AP, then the numbers abc, ...

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  12. What is the nth term of the sequence 1,5,9,13,17. . .. ?

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  13. What does the series 1+3^(-1//2)+3+(1)/(3sqrt3)+ . . .represent ?

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  14. What is the sum of the series 1+(1)/(2)+(1)/(4)+(1)/(8)+. . .?

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  15. If 1/4, 1/x and 1/10 are in HP, then what is the value of x ?

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

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  17. If p,q and r are in AP as well as GP, then which one of the following ...

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  18. What is the sum of first eight terms of the series 1-(1)/(2)+(1)/(4)-(...

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  19. The angles of a triangle are in AP and the least angle is 30^(@). What...

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

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