There are two hosts on 10BASE5 Ethernet. They send data at the same time, resulting in collision. So it is retransmitted according to the truncated binary exponential backoff algorithm. The number of retransmissions is I, I = 1, 2, 3. Try to calculate the probability of failure of the first retransmission, the probability of failure of the second retransmission, the probability of failure of the third retransmission, and the average number of retransmissions before a station successfully sends data.