Difference between revisions of "A choose b"
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== Why is it important? == | == Why is it important? == | ||
| − | a choose b counts the number of ways you can pick b things from a set of a things. For example | + | a choose b counts the number of ways you can pick b things from a set of a things. For example $\binom{8}{2}=\frac{8!}{2!(8-2)!}=\frac{8(7)}{2}=\frac{42}{2}=21 |
Revision as of 16:52, 15 June 2019
Here is the formula for a choose b: 
. This is assuming that of course 
.
Why is it important?
a choose b counts the number of ways you can pick b things from a set of a things. For example $\binom{8}{2}=\frac{8!}{2!(8-2)!}=\frac{8(7)}{2}=\frac{42}{2}=21
