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If there is a box with seven white balls and five red balls. Two balls are drawn at random, what is the probability that one ball is white and the other red?
7 white and 5 red.
so choose 1 from seven white balls and 1 from 5 red balls.
this can be done in 7c1 x 5c1 = 35
total possibilities = 12c2 = 66.
so probability = 35
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