[" 102.If "1-(1)/(3)+(1)/(5)-(1)/(7)+(1)...

[" 102.If "1-(1)/(3)+(1)/(5)-(1)/(7)+(1)/(9)-(1)/(11)+cdots=(pi)/(4)," then value of "(1)/(1times3)],[+(1)/(5times7)+(1)/(9times11)+cdots" is "],[[" a."pi/8," b."pi/6," c."pi/4," d."pi/36]]

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If 1-(1)/(3)+(1)/(5)-(1)/(7)+(1)/(9)-(1)/(11)+...=(pi)/(4), then value of (1)/(1xx3)+(1)/(5xx7)+(1)/(9xx11)+... is pi/8bpi/6c. pi/4d. pi/36

(1)/(1.3)+(1)/(2.5)+(1)/(3.7)+(1)/(4.9)+...=

If (1)/(1!9!)+(1)/(3!7!)+(1)/(5!5!)+(1)/(7!3!)+(1)/(9!1!)=(2^n)/(10!) , then n=

(1)/(1times3)+(1)/(3times5)+(1)/(5times7)+(1)/(7times9)+(1)/(9times11)+(1)/(11times13)

7.The value of (1)/(1.2.3.4)+(1)/(2.3.4.5)+......+(1)/(9.10.11.12) is

If (1)/(1^(2))+(1)/(2^(2))+(1)/(3^(2))+cdots "to" oo = (pi^(2))/(6) then (1)/(1^(2)) +(1)/(3^(2))+(1)/(5^(2))+cdots equals

If 1-1/3+1/5-1/7+1/9-1/(11)+=pi/4 , then value of 1/(1xx3)+1/(5xx7)+1/(9xx11)+ is pi//8 b. pi//6 c. pi//4 d. pi//36