A computer store has 15 copies of a software package. Unknown to the store, 3 of the packages have corrupted disks. What is the probability that a) a customer buys one package, that it will be one of the packages that contains a corrupted disk? b) a customer buys one package, that it will be one of the packages that is not corrupted? c) a customer buys three packages and all are corrupted.
A computer store has 15 copies of a software package. Unknown to the store, 3 of the packages have corrupted disks. What is the probability that
a) a customer buys one package, that it will be one of the packages that contains a corrupted disk?
b) a customer buys one package, that it will be one of the packages that is not corrupted?
c) a customer buys three packages and all are corrupted.
d) a customer buys three packages and two of them are corrupted.
e) a customer buys three packages and one of them is corrupted.
f) a customer buys three packages and none of them are corrupted.
g) Find the sum of the probabilities in parts c–f and write an explanation for the sum.
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