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Fill in the blanks so as to make each of the following statements true :
If the sum of first n terms of an AP is `2n^2+5n, ` then its nth term is .........

A

`4n-3`

B

`3n-4`

C

`4n+3`

D

`3n+4`

Text Solution

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The correct Answer is:
C
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KUMAR PRAKASHAN-SEQUENCE AND SERIES-Textbook based MCQs
  1. (1)/(2 xx 5) + (1)/(5 xx 8) + (1)/(8 xx 11)+ …..100 terms= ……

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  2. If a,b,c are in HP, then prove that (a+b)/(2a-b)+(c+b)/(2c-b)gt4.

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  3. Fill in the blanks so as to make each of the following statements true...

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  4. If first term, second term and last term of an A.P are a,b and 2a resp...

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  5. If a(1), a(2), a(3).,,,,,,,,a(n) are in A.P and their common differenc...

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  6. The sum of first n even natural numbers is k times the sum of first n ...

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  7. The sum of …….terms of on A.P. 3, 7, 11, 15,….. Will becomes 406

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  8. S(n) denots the sum of first n terms of an A.P. Its first term is a an...

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  9. If a, b, c are in G.P. and a^(1/x) =b^(1/y)=c^(1/z) , prove that x, y...

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  10. The p^(th), q^(th) and r^(th) terms of an A.P. are in geometric progre...

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  11. If a,b,c are in G.P and A.M of a and b is x and A.M. of b and c is y t...

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  12. If 10^(th) and 4^(th) terms of a G.P are 9 and 4 respectively, then it...

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  13. If A be one A.M and p, q be two G.M.'s between two numbers then 2A is ...

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  14. If m^(th), n^(th) and p^(th) terms of an A.P and G.P be equal and be r...

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  15. The A.M of two positive number is x and two G.M.'s between them are y ...

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  16. Series (1)/(log(2)^(2)) + (1)/(log(4)^(4)) + (1)/(log(8)^(4)) + …..+ (...

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  17. If Sigma n = 210 " then " Sigma n^(2)=…….

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  18. sqrt2 + sqrt8 + sqrt18 + sqrt32 +…..up to n terms is…….

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  19. 1^(2) + 3^(2) + 5^(2)+……..up to n terms is……..

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  20. If S(n)=1 + (1)/(2) + (1)/(2) + …..+ (1)/(2^(n-1)), (n in N) then …….

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