Write two functions called permutation() and combination(), where permutation() computes and returns n!/(n-r)!whereas combination() returns. n!/(n-r)!r!A third function called par_input() gets the input values for n and r. An example of correct program behavior follows: Input: 3 2 Output: The permutation is 6, and the combination is 3.

Here is the program in C.

#include<stdio.h>   // header file used to input output operations

int permutation(int n, int r);  // function to computer permutation

int combination(int n, int r);  //function to compute combination

int factorial(int number);  // function to computer factorial

void par_input(int n, int r);    // function take take input value of n and r

int main()  //start of main() function body

{    

   int n,r;  // declare n and r variables

   par_input(n,r);  //calls par_input() function to get values of n and r

}

int permutation(int n, int r)   // method to calculate permutation

{

   return factorial(n) / factorial(n-r);  //formula for permutation

}

int combination(int n, int r)  // method to calculate combination

{

   return permutation(n, r) / factorial(r); //formula for combination

}

int factorial(int number)  // to find factorial of a number

{

   int fact = 1;      

   while(number > 0)  //loop continues until value of number gets <=0

   {

       fact = fact *number;  

       number--;

   }      

   return fact;

}

void par_input(int n, int r)  //function to take input values

{

   printf("Enter n: ");  //prompts user to enter the value of n

   scanf("%d", &n);      //reads the value of n from user

   printf("Enter r: "); ////prompts user to enter the value of r

   scanf("%d", &r); //reads the value of r from user

  //calls the combination and permutation methods to display results

   printf("The permutation is = %d\n", permutation(n, r));    

   printf("The Combination is = %d", combination(n, r));      

}

Explanation:

The output of the program is attached in the screen shot.

answer is:

a). backstage view

explanation:

backstage view is the area where files and data about them is managed— creating, saving, printing, sending to others, inspecting for hidden metadata or personal information, and setting options. so in this way we can add many things to our document swiftly.

i hope you get the idea.