Problem 2: Write recursive definition of a method named Combinations that takes two integers n and r as parameters and returns the number of unique combinations of r items from a group of n items. Number of combinations C(n,r) for the given parameters n and r can be computed using the equation: n! C(n,r) r! * (n r)! 4! For example, C(4,3) should return 4. 3! • (1)! Take the input from the user and make sure that the input is valid.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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using C++ program.

Problem 2: Write recursive definition of a method named Combinations that takes two integers
n and r as parameters and returns the number of unique combinations of r items from a group of
n items. Number of combinations C(n,r) for the given parameters n and r can be computed using
the equation:
n!
C(n,r)
r! *
(п — r)!
4!
For example, C(4,3)
should return 4.
3! * (1)!
Take the input from the user and make sure that the input is valid.
Transcribed Image Text:Problem 2: Write recursive definition of a method named Combinations that takes two integers n and r as parameters and returns the number of unique combinations of r items from a group of n items. Number of combinations C(n,r) for the given parameters n and r can be computed using the equation: n! C(n,r) r! * (п — r)! 4! For example, C(4,3) should return 4. 3! * (1)! Take the input from the user and make sure that the input is valid.
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