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1.Write functions named *Permutation (int *n, int *r) and *Combination (int *n, int *r) to compute the permutation and combination between two numbers taken from the user. For the above two functions create another function named Factorial (int x) which calculates the factorial of number. Furthermore, the program finds the GCD between the two numbers taken from user via *ged (int *n, int*r). The program stores the value of god in a file. a