Question: 15 people are selected at random and without replacement, what is the probability that at least two persons have contributed? 15 The probability is p

15 people are selected at random and without replacement, what is the probability that at least two persons have contributed? 15 The probability is p that a message sent over a communication channel is garbled. If the message is sent repeatedly until it is transmitted reliably, and if each time it takes 2 minutes to process it, what is the probability that the transmission of a message takes more than 7 minutes?

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