# Probability

Let A and B be two events with P(A interception B)= 0.2, P(B) =0.15, and P(A U B)= 0.75. Find P(A)

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1. Draw a Venn diagram

say we have 100 items

75 are in A or B (25 are outside)

15 are in B

2 of those are also in A (intersection you mean I think)

so 13 are exclusively in B

That means 75 - 13 = 62 are in A

62/100 = .62

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posted by Damon

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