A set of 4 numbers is selected at random from s 12345678

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A set of 4 numbers is selected at random from S = {1,2,3,4,5,6,7,8} without replacement. What is the probability that

(a) exactly 2 of them are even?

(b) none of them is even?

(d) exactly 3 of them are even?

(e) all of them are even?

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