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This model computes the number of ways of selecting 5 objects from a set of 52 objects.
This is expressed by 52!/(5!*(52-5)!), or more generally, the number of ways of choosing k objects from n is n!/(k!*(n-k)!). The intermediate factorial expressions may be very large and result in overflow. We avoid possible overflow by working with the logs of the intermediate expressions. Note that:
Gamma(n+1) = n!, and LGM(n+1) = Log(Gamma(n+1)).