1.

If a = Sigma_(n=1)^(oo) (2n)/(2n-1!),b=Sigma__(n=1)^(oo) (2n)/(2n+1!) then ab equals

Answer»

1
`E^(2)`
`(e-1)/(e+1)`
`(e+1)/(e-1)`

ANSWER :a


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