Q .     `sum_(n=1)^(oo)(2n)/((2n+1)!)=`

EAMCET 2011
A

`1/e`

B

`e/2`

C

`e`

D

`2e`

HINT

`sum_(n=1)^(oo)(1/(2n!)-1/((2n+1)!))`
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