A bag contains 7 white and 5 black balls...

A bag contains 7 white and 5 black balls. If 3 balls are drawn simultaneously at random, what is the probability that they are not all of the same colour Calculate the probability of the same event for the case where the balls are drawn in succession with replacement between drawings.

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A bag contains 7 white and 5 black balls. If 3 balls are drawn simultaneously at random, what is the probability that they are not all of the same colour Calculate the probability of the same event for the case where the balls are drawn in succession with replacement between drawings.

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