Asked by Anonymous
Please help me with this question, I don't know how to solve it:
There are 6 balls in a box - 4 white and 2 black. If we select three balls, what is the probability of selecting exactly one white one?
There are 6 balls in a box - 4 white and 2 black. If we select three balls, what is the probability of selecting exactly one white one?
Answers
Answered by
oobleck
P(WBB) = 4/6 * 2/5 * 1/4
P(BWB) = 2/6 * 4/5 * 1/4
P(BBW) = 2/6 * 1/5 * 4/4
so, adding them up, P(one W) = 1/5
P(BWB) = 2/6 * 4/5 * 1/4
P(BBW) = 2/6 * 1/5 * 4/4
so, adding them up, P(one W) = 1/5
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