algebra 2 and Trigeonomerty

a bag contains 12blue, 10 green and 6 red and 2 white marbles.
a) If you draw 3 marbles without putting them back, what is the probability that all 3 are blue?
12/30 * 9/27 =0.133?
b) If you draw 2 marbles without putting them back, what is the probability that neither is blue?
18/30 * 16/28=0.34?

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  1. (a) You have to multiply for the three draws, and allow for the changing population of blues and the total:

    12/30 * 11/29 * 10/28

    (b) That would be

    18/30 * 17/29

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    posted by Steve

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