starboy

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probability type question

There are 9 b***s in a sac. There are 3 reds b***s, 2 white b***s and 4 black b***s. If three b***s are drawn from the sac without replacement.
i. find the probability that the 1st ball is red and the last ball is black
ii. find the probabilty read more ..

starboy Apr 16, 2015