The probability of a successful missile launch is 09 test

The probability of a successful missile launch is 0.9. Test launches are conducted until 3 successful launches are achieved.

(a) What is the probability that exactly 6 launches will be required?

(b) What is the probability that at most 4 launches will be required?

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The probability of a successful missile launch is 09 test : the probability of a successful missile launch is 0.9. test launches are conducted until 3 successful launches are

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