how do i find the sum to infinity of the sum of (2r+1)/r! where r>=1. i have no clue about sums and factorials.

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- Dec 15th 2012, 08:13 PMrighteous818sum to infinity
how do i find the sum to infinity of the sum of (2r+1)/r! where r>=1. i have no clue about sums and factorials.

- Dec 15th 2012, 08:22 PMrichard1234Re: sum to infinity

(simply shifted the "index" by 1)

Adding, we get