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What is the probability that events A and B both occur? (1)

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What is the probability that events A and B both occur? (1) [#permalink] New post 15 Jul 2004, 20:40
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16. What is the probability that events A and B both occur?
(1) The probability that event A occurs is 0.8.
(2) The probability that event B occurs is 0.6.
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 [#permalink] New post 16 Jul 2004, 04:56
E it is. We have to know whether events are dependents or independents.
If events are independents, then yes, P(A,B) = P(A) * P(B) = .8*.6 = .48
However, if events are dependents, we cannot find the answer from given choices. You might want to read a bit about dependent/independent events in probability: http://mathforum.org/library/drmath/view/56494.html
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 [#permalink] New post 16 Jul 2004, 12:09
Good catch Paul. When I read the question, I "assumed" the phrase "and B both occur?" meant dependently. Wow, what a difference by you catching that. Right or Wrong. Black and White.

Geez, I'm pretty sure that 35% of the test or the difference of a 650 or 730 is catching these little details. But in the scheme of the question, getting it right or wrong makes them big details.
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  [#permalink] 16 Jul 2004, 12:09
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What is the probability that events A and B both occur? (1)

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