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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: ?(?,?) = ?! ?! ∗ (? − ?)! For example, ?(4,3) = ?! should return 4. ?! ∗ (?)! Take the input from the user and make sure that the input is valid. using C+

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: ?(?,?) = ?! ?! ∗ (? − ?)! For example, ?(4,3) = ?! should return 4. ?! ∗ (?)! Take the input from the user and make sure that the input is valid. using C+

Database System Concepts
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
Problem 1PE
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  1. 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:

    ?(?,?) = ?!
    ?! ∗ (? − ?)!

    For example, ?(4,3) = ?! should return 4. ?! ∗ (?)!

    Take the input from the user and make sure that the input is valid. using C++

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