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

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SVP
Joined: 16 Oct 2003
Posts: 1801
Let A and B be events such that P(A ^ B) = 1/4, P( [#permalink]

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04 Nov 2003, 13:40
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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)?
Intern
Joined: 04 Oct 2003
Posts: 42
Location: Silicon Valley, CA

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04 Nov 2003, 19:52
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
SVP
Joined: 03 Feb 2003
Posts: 1604

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05 Nov 2003, 00:38
agree
P(A OR B) = P(A) + P(B) - P (A AND B)
1/4=2/3+1/2-X
X=11/12
05 Nov 2003, 00:38
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