Refer to Exercise 9.
a. Find 
.
b. Find 
.
c. Find P(X+Y=5).
(c) P(X + Y = 5) = P(X = 1 ? Y = 4)+P(X = 2 ? Y = 3)+P(X = 3 ? Y = 2)+P(X = 4 ? Y = 1) = 0.15
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