Question: Suppose we are using Paxos consensus, allowing for up to F process failures. 1 . What is the minimum number of replicas that we require

Suppose we are using Paxos consensus, allowing for up to F process failures.
1. What is the minimum number of replicas that we require for Paxos consensus? How many votes are required for a round to conclude in Paxos?
2. Why is the "propose" stage in the Paxos algorithm required? Is it always necessary?
3. What failure model does Paxos consensus assume?

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