5 men are in a company out of 20 are garduate. If 3 men are picked out of 20 at random then what is the probability that all are garduate and at least one is graduate.
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Probablity that all are graduate = 5/20 * 4/19 * 3/18
= 1/4 * 4/19 * 3/18
= 1/114
Probability that at least one is graduate = 1 - 1/114
= 113/114
= 1/4 * 4/19 * 3/18
= 1/114
Probability that at least one is graduate = 1 - 1/114
= 113/114
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