# Math Help - Help

1. ## 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"

2. You have three cases to calculate and add up.
Here is one: $P\left( {W_1 W_2 B_3 } \right) = \frac{2}{6} \cdot \frac{8}{{12}} \cdot \frac{3}{4}$.

You do the other two cases.
Don't forget to add them up.

3. Thank you Plato but could you show me the other two cases

4. Originally Posted by Infiniti
Could you show me the other two cases?
No. I will not do your work for you.
What have you done on this problem.
Take what I did for you, then apply it to the other two cases.

5. Thanks for all your help Plato! I finally got it.
Its just that my teacher comes in the class and gives us the paperwork without any explanation. His other DataManagement class has an average of 57% and our class is at 62%. Thank you

6. Originally Posted by Infiniti
His other DataManagement class has an average of 57% and our class is at 62%.
That sound like my foundations class at mid-term! But this week I had 30% drop from that class. Given the drops, the class average went up 20%.