.(i) Using the identity r=0 trr! = et, prove that for any real t, the following identity holds: (ii) Telephone calls arrive at a large

.(i) Using the identity

Σ∞r=0 tr∕r! = et, prove that for any real t, the following identity holds:

(ii) Telephone calls arrive at a large company according to a Poisson process with a rate ???? per minute. If time is measured in minutes, and t (Hint: You may find the result in Part (i) to be useful.)

=(e + e). (2r)!