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2.3.3 Conditional probability (A-level only)

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Question 2
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The events A A\,A and B B\,B are such that P(A)=0.4P(A) = 0.4P(A)=0.4, P(B)=0.5P(B) = 0.5P(B)=0.5, P(A∩B)=0.3P(A \cap B) = 0.3P(A∩B)=0.3.

a.

Find P(A∪B)P(A \cup B)P(A∪B).

[2]
b.

Find P(A∣B)P(A|B)P(A∣B).

[3]
c.

Find P(A′∣B′)P(A'|B')P(A′∣B′).

[3]

2.3.3 Conditional probability (A-level only) Questions

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