What is the probability that a random graph G(n,p) with n nodes and probability p = c some constant value is complete?
By complete I mean that every pair of nodes is connected by an edge. Check this for further details.
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By your notation, I'm assuming that $p$ is the probability for the existence of an edge between any two nodes. Then you can think of the generation of a random graph as a series of ${n\choose2}$ Bernoulli trials, one for each possible edge, with probability $p$ of success in each trial. The probability that they are all successes, and so resulting in a complete graph, is $p^{n\choose2}$.