conditional probability? coloured marbles - one is revealed

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graham

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2 white marbles, 1 black marble and one yellow in a bag.

Two are drawn.

One is later revealed to be white.

What is the probability that the other is also white?
 
graham said:
2 white marbles, 1 black marble and one yellow in a bag.

Two are drawn.

One is later revealed to be white.

What is the probability that the other is also white?
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Are the two drawn at the same time, or is the first put back in before the second is drawn?

When you reply, please include a clear statement of your thoughts and efforts so far. Thank you! ;)
 
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