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If S(n) = sum(r=1)^(n) (r )/(1.3.5.7"……"...

If `S_(n) = sum_(r=1)^(n) (r )/(1.3.5.7"……"(2r+1))`, then

A

`S_(n) = 1/2 [1-(1)/(1.3.5"……."(2n+1))]`

B

`S_(oo) = 1/2`

C

`1/4 [1+(1)/(1.3.5"……"(2n-1))]`

D

`S_(oo) = 1/4`

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A
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