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Let A and B be events such that P(A ^ B) = 1/4, P(

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SVP
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Let A and B be events such that P(A ^ B) = 1/4, P( [#permalink] New post 04 Nov 2003, 12:40
Let A and B be events such that P(A ^ B) = 1/4, P( ╦Ь A) = 1/3, and P(B) =
1/2. What is P(A U B)?
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understading the question [#permalink] New post 04 Nov 2003, 18:52
does P(A ANd B) mean P(A OR B)

the formula that you are looking for i s
P(A OR B) = P(A) + P(B) - P (A AND B)
= 1 - P(~A) + P(B) - P(A AND B)
= 1 - 1/3 + 1/2 - 1/4
= 11/12
:roll:
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 [#permalink] New post 04 Nov 2003, 23:38
agree
P(A OR B) = P(A) + P(B) - P (A AND B)
1/4=2/3+1/2-X
X=11/12
  [#permalink] 04 Nov 2003, 23:38
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Let A and B be events such that P(A ^ B) = 1/4, P(

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