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The problem, as you've defined it, is not well-defined. By "unique subsets"
you could mean either (a) all the ways of partitioning the set of 20 objects
into subsets of 4 objects each (i.e., each object falls into exactly one
subset for any one partitioning of the set), or (b) simply all the possible
combinations of 20 objects taken 4 at a time.
----- Original Message -----
From: "Craig" <craigbud@xxxxxxxxxxx>
To: <omega-list@xxxxxxxxxx>
Sent: Tuesday, April 16, 2002 3:56 PM
Subject: OT: math question
> I know there is a formula for the following example, and I must have
> learned it in high school, but I'm now lost in senility:
>
> Out of a list of numbers 1 through 20, I would like to find all the
> possible unique subsets of 4 numbers.
>
> Thanks
>
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