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Les talons
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Homework Statement
A bowl contains 3 red, 4 green, and 5 blue chips. A batch of 3 chips is withdrawn at random.
What is the probability the batch contains only one color?
What is the probability the batch contains exactly two colors?
Homework Equations
The Attempt at a Solution
P(all red) = 3/12 *2/11 *1/10
P(all green) = 4/12 *3/11 *2/10
P(all blue) = 5/12 *4/11 *3/10
What does it mean if the batch has only one color? Should I put the three probabilities above, or do I have to multiply them together?
P(2 red) = 3/12 *2/11 *9/10
P(2 green) = 4/12 *3/11 *8/10
P(2 blue) = 5/12 *4/11 *7/10
Again, what does it mean if a batch has exactly two colors? Should I put three possible answers?