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) (Show Source): You can put this solution on YOUR website!
.
= = 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.
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