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A datagram network allows routers to drop packets whenever they need to. The probability of a router discarding a packet is p. Consider the case of a source host connected to the source router, which is connected to the destination router, and then to the destination host. If either of the routers discards a packet, the source host eventually times out and tries again. If both host-router and router-router lines are counted as hops, what is the mean number of hops a packet makes per transmission?

1. $p^2-3p+3$
2. $p^2+3$
3.  3p+3
4.  p+3

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Ans b?
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Can you send solutions?
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First let me know whether it is correct or not
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Correct answer is given to be A
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