4) Two processes, A and B, each need three records, 1, 2, and 3 in a database. If A asks for them in the order 1,2,3, and B asks for them in the same order, deadlock is not possible. With three resources, there are 3! (factoral 3*2*1) or six possible combinations in which each process can request them. What fraction of all the combinations is guaranteed to be deadlock free?
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