Choose the correct formula for combination. A . n!/r!(n-r)! B. n!/(n-r)!

asked Sep 13, 2023 14.9k views

22 votes

Choose the correct formula for combination.
A . n!/r!(n-r)!
B. n!/(n-r)!

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2 votes

The answer is A. n!/r(n-r)!

Li answered Sep 14, 2023

by Li

3.9k points

6 votes

Answer:

A.
(n!)/((n-r!)r!)

Explanation:

The formula for combinations is:
(n!)/((n-r!)r!) .

The formula for permutations is:
(n!)/((n-r!))

So, the correct answer is A.

Bill Huneke answered Sep 19, 2023

4.3k points

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