Question: 6. The summation here is P k =0 P i =k+1 P(X = i ). Change the order of summation. For the second part, use

6. The summation here is P

∞k

=0 P

∞i

=k+1 P(X = i ). Change the order of summation.

For the second part, use the result of Exercise 1.20.

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