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Posted by on Tuesday, January 25, 2011 at 2:23pm.

A bag contains 3 red, 5 black and 5 blue marbles. Four marbles are selected at random without replacement:
- the probability that all 4 are black?
-the probability that exactly two are blue and none are red?

  • math - , Tuesday, January 25, 2011 at 10:29pm

    2/5

  • math - , Wednesday, January 26, 2011 at 12:32pm

    First black marble = 5/13, second = 4/12, third = 3/11, fourth = 2/10.

    The probability of all events occurring is found by multiplying the individual probabilities.

    First blue = 5/13, second = 4/12, first non-red = 8/11, second non-red = 7/10.

    The probability of all events occurring is found by multiplying the individual probabilities.

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