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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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