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The sum of first 10 terms and 20 terms o...

The sum of first 10 terms and 20 terms of an AP are 120 and 440, respectively.
What is its first term ?

A

3

B

4

C

8

D

10

Text Solution

Verified by Experts

The correct Answer is:
C
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PUNEET DOGRA-SEQUENCE AND SERIES-PREVIOUS YEAR QUESTIONS
  1. What is the sum of the series 1+(1)/(2)+(1)/(4)+(1)/(8)+. . .?

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

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

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

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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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  17. The arithmetic mean of two numbers exceeds their geometric mean by 2 a...

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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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  19. What is the sum of all natural numbers between 200 and 400 which are d...

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  20. Which term of the sequence 20, 19(1)/(4),18(1)/(2),17(3)/(4), . . Is ...

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