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- ; This example demonstrates how to use Mercury's built-in
- ; FACT function (FACT(x) = x factorial). The problem is:
- ; In a bridge game, the declarer controls 7 trump cards.
- ; We must determine the probability that the remaining
- ; 6 trump cards are evenly distributed (3 and 3) among
- ; the opposing two players. We calculate both the
- ; approximate and the exact probability in this example.
-
- ; the binomial coefficient formula
- ; ways of choosing k of n items
- C(n,k) := BINOM(n,k) ; = FACT(n) / (FACT(k) FACT(n-k))
-
- ; approximate probability of 3-3 split
- ProbApprox = C(6,3) / 2^6
-
- ; exact probability of 3-3 split
- ProbExact = C(6,3) * C(20,10) / C(26,13)