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Sum of n terms of series 1.3+3.5+5.7+......

Sum of n terms of series 1.3+3.5+5.7+....is

A

`2/3n(n+1)(2n+1)+n`

B

`2/3n(n+1)(2n-1)-n`

C

`2/3n(n-1)(2n-1)-n`

D

none of these

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PATHFINDER-PROGRESSION AND SERIES -QUESTION BANK
  1. If x in{1,2,3......9} and fn(x) =x x x ...x (n digits ), then fn^2(3)+...

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  2. Four no. are in AP . If their sum is 20 and the sum of their squares i...

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  3. Sum of n terms of series 1.3+3.5+5.7+....is

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  4. If the sum of an infinitely decreasing GP is 3, and the sum of the squ...

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  5. 1+2.2+3.2^2+4.2^3+....100.2^99 equals

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  6. If A1,A2 be two AM's and G1,G2 be the two GM's between two number a an...

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  7. If H1,H2,H3,.......Hn be n harmonic means between a and b then (H1+a)...

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  8. If a,b,c are in AP and a^2,b^2,c^2 are in HP, then

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  9. If between 1 and 1/31 there are n H.M's and ratio of 7th and (n-1)^th ...

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  10. (a^(n+1)+b^(n+1))/(a^n+b^n) is AM/GM/HM, between a and b if n is equal...

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  11. Sum of infinite terms of series 3+5. 1/4+7. 1/4^2+..... is

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  12. The value of x for which 1/(1+sqrtx),1/(1-x),1/(1-sqrtx) are in AP li...

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  13. If the non-zero numbers a,b,c are in AP and tan^-1a,tan^-1b,tan^-1c ar...

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  14. If a,b,c,d are distinct positive numbers in AP, then

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  15. If sum(r=1)^nr(r+1)(2r+3)=an^4+bn^3+cn^2+dn+e, then

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  16. The pth term Tp of HP is q(p+q) and qth term Tq is p(p+q) when pgt1,qg...

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  17. For a positive integer n let a(n)=1+1/2+1/3+1/4+.......+1/((2^n)-1) th...

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  18. A geometric progression of real number is such that the sum of its fir...

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  19. If the first and the (2n-1)^th term of an A.P,G.P anf H.P are equal an...

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  20. If a,b,c be in H.P prove that (1/a+1/b-1/c)(1/b+1/c-1/a)=4/(ac)-3/b^2

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