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| Math Central | Quandaries & Queries |
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Question from Esther: I need 4digits combination of 235689 and without replacement. Thanks |
Hi Esther,
The number of ways of choosing 4 things from 6 is 6-choose-4. A method to calculate 6-choose-4 is explained in my response to an earlier question. To list all the 4 digit combinations I think it's easiest to list the 2 digits that get removed. For example
Removed |
Sample |
|---|---|
23 |
5689 |
25 |
3689 |
. |
. |
. |
. |
29 |
3568 |
35 |
2689 |
. |
. |
. |
. |
List them all. Did you get 6-choose-4 samples?
Penny
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