Program Plan: Following functions are used in the program: Cout: To display the explanatory text. Cin: To take input from user. Following variables are used in the program: permutation: is used to store the permutation of (n)numbertaken (r)numbers at a time. n : is used to store the total number of items. r: is used to store the number that must be taken from total numbers. num: is a temporary variable used while calculating the factorial of a number. Summary Introduction: Program will use the Main () method, which will prompt the user to enter the value for variable n and r and calculate permutation of (n)number taken (r)numbers at a time. Formula to calculate the permutation of (n)number taken (r)numbers at a time is n ! r ! ( n − r ) ! Program Description: The purpose of the program is to calculate the permutation of the given number(n) taken (r)numbers at a time.

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Chapter 3, Problem 6PP

Program Plan Intro

Program Plan:

Following functions are used in the program:

Cout: To display the explanatory text.

Cin: To take input from user.

Following variables are used in the program:

permutation: is used to store the permutation of (n)numbertaken (r)numbers at a time.

n : is used to store the total number of items.

r: is used to store the number that must be taken from total numbers.

num: is a temporary variable used while calculating the factorial of a number.

Summary Introduction:

Program will use the Main () method, which will prompt the user to enter the value for variable n and r and calculate permutation of (n)number taken (r)numbers at a time. Formula to calculate the permutation of (n)number taken (r)numbers at a time is n!r!(n−r)!

Program Description:

The purpose of the program is to calculate the permutation of the given number(n) taken (r)numbers at a time.

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