(P4.57)- Use the probabilities of Exercise 4.56 to show that these equalities are true....

(P4.57)- Use the probabilities of Exercise 4.56 to show that these equalities are true:

a. P(A ^ B) = P(A)P(B/A)

b. P(A ^ B) = P(B)P(A/B)

c. P(A U B) = P(A) + P(B) - P(A ^ B)

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