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Combinations Function
Math Probability Class

Public Function Combinations( _
      ByVal vNumber As Variant _
    , ByVal vChosen As Variant _
    ) As Variant

Combinations of N things taken C at a time, WITHOUT repetition.

Summary: Function returns the number of possible ways of arranging C objects chosen from N objects when the order of the chosen objects does not matter, such as in playing card games.
Examples: 
    Combinations(1, 1) = 1
    Combinations(2, 1) = 2
    Combinations(2, 2) = 1
    Combinations(4, 1) = 4
    Combinations(4, 2) = 6
    Combinations(4, 3) = 4
    Combinations(4, 4) = 1
    Combinations(21, 9) = 293930
    IsNull(Combinations(9, 21)) = True
See also: 
    CombinationsWithRepetitions Function
    Permutations Function
    Factorial Function
    COMB Function (Microsoft Excel)
vNumber: The number of unique items from which combinations can be constructed. Function returns Null if vNumber is Null, cannot be interpreted as a number, is less than zero (<0), or is less than vChosen. vNumber will be rounded down to the nearest integer.
vChosen: The number of items which are to be combined each time some are selected. Function returns Null if vChosen is Null, cannot be interpreted as a number, or is less than zero (<0). vChosen will be rounded down to the nearest integer.
Note: Function will return Null instead of generating an error if any of its calculations cause Overflow or other types of errors.
Definition: 
    Factorial(N) / (Factorial(C) * Factorial(N - C))
v1.5 Pro Note: The argument names and the implementation of this function has changed.

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