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A large number of stations in a slotted ALOHA network generate 50 requests per second on average, where the requests include originals and retransmissions. Suppose

A large number of stations in a slotted ALOHA network generate 50 requests per second on average, where the requests include originals and retransmissions. Suppose the duration of a time slot is 20 ms.

(a) What is the probability that the message is successfully transmitted on the 10-th attempt?

(b) What is the expected number of transmission attempts needed for a successful delivery? (Give the exact results.)

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