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From a lot of 15 ​missiles, 4 are selected at random and fired. Suppose the lot...

From a lot of 15 ​missiles, 4 are selected at random and fired. Suppose the lot contains 3 defective missiles that will not fire.

​(a) What is the probability that all 4 missiles will​ fire?

​(b) What is the probability that at most 2 will not​ fire?

Math   Statistics-And-Probability   
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