Batts137 Batts137

20-05-2014
Mathematics

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A bag contains 4 blue, 4 red, and 4 green marbles. Four marbles are drawn at random from the bag. How many different samples are possible which include exactly two red marbles?

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draonrider draonrider

20-05-2014

you make a tree diagram to find the possible outcomes, which there are 81 possible outcomes, 24 of which have exactly 2 red in them.

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