SOLUTION: In order to conduct an experiment, 4 subjects are randomly selected from a group of 20 subjects. How many different groups of 4 subjects are possible?

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Question 1125888: In order to conduct an experiment, 4 subjects are randomly selected from a group of 20 subjects. How many different groups of 4 subjects are possible?
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.
C%5B20%5D%5E4 = %2820%2A19%2A18%2A17%29%2F%281%2A2%2A3%2A4%29 = 4845 ways.

It is about Combinations.

On Combinations,  see the lessons
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
    - OVERVIEW of lessons on Permutations and Combinations
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic  "Combinatorics: Combinations and permutations".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.