I have this question: How many subsets with 7 elements does a set with 9 elements have? Can someone show me how to solve this or a similar problem?
Last edited by malfist; Jan 26th 2009 at 07:00 PM.
Follow Math Help Forum on Facebook and Google+
Originally Posted by malfist Can someone show me how to solve this or a similar problem? This is a simple combination: $\displaystyle {9 \choose 7} = \frac{9!}{(7!)(2!)}$
View Tag Cloud