How many different ways are there to select a group of 3 out of 7 people for a cyber-sport team with 3 distinct roles?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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How many different ways are there to select a group of 3 out of 7 people for a cyber-sport team with 3 distinct roles?

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If a process is done in two phases in which the first phase can be done in m ways and the second phase can be done in n ways then according to the fundamental principle of counting the process can be done in a total of mn ways.

If there are n objects and the n objects are to be placed in m different places, then the number of possible ways is nPm if order is considered and nCm if order is not considered.

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