You have three cases to calculate and add up.

Here is one: .

You do the other two cases.

Don't forget to add them up.

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- Oct 21st 2007, 08:45 AM #1

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## Help

"Of three urns, the first contains 2 white and 4 black cards, the second contains 8 white and four black cards, and the third contains 1 white and 3 black card.

**If one card is selected from each urn, find the probability that exactly 2 white cards are drawn**"

- Oct 21st 2007, 08:56 AM #2

- Oct 22nd 2007, 04:32 PM #3

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- Oct 2007
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- Oct 22nd 2007, 04:53 PM #4

- Oct 22nd 2007, 04:56 PM #5

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- Oct 22nd 2007, 05:12 PM #6