Question

19. If PA B) = 5/6, P(A) = 1/2 and PCB) = 2/3, what is P (A U B)?
(a) 1/3
(b) 5/6
(c) 2/3
(d) 4/9​

Answer 1

Answer:

a) 1/3

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Answer 2

Answer:

If two events A and B are independent then,

P(A n B)= P(A).P(B)

P(A u B)= P(A)+P(B)-P(A n B)

Since A and B are independent, so

P(A u B)= P(A)+P(B)-P(A).P(B)

0.9=0.6+P(B)-(0.6 x P(B))

P(B)(1–0.6)=0.3

P(B)=3/4= 0.75

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