text: #pragma once
  
  #if !defined(MYMATH_PROBABILITY_H)
  #define MYMATH_PROBABILITY_H
  
  int     Factorial(int n);
  __int64 Factorial64(int n);
  
  int Combinations(int n, int r);
  
  int Permutations(int n, int r);
  
  #endif // !defined(MYMATH_PROBABILITY_H)
  