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Q3.(12) One store notes that the

What is the probability that the third telephone order selected will be the first to contain an error?

What is the probability that the supervisor will inspect between two and six (inclusive) telephone orders before finding an error?

What is the probability that the inspector will examine at least seven orders before finding an error?

Suppose the first four telephone orders contain no errors, what is the probability that the first error will be on the eighth order or later?thank you very much
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