Posted by Brad on Thursday, May 17, 2012 at 10:59pm.
Assuming no replacement,
The probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
None defective = 9/12 * 8/11 * 7/10 * 6/9 = ?
One defective = 3/12 * 9/11 * 8/10 * 7/9 = ?
Three defective = 3/12 * 2/11 * 1/10 * 9/9 = ?
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