Homework Help: Math

Posted by BWB on Saturday, May 8, 2010 at 12:02am.

For the three-letter set {R, S, T}, find the two-letter combinations.

I realize that this deals with combinations and not permutations. I just do not understand how they want this done.

Math - Reiny, Saturday, May 8, 2010 at 12:27am
you want 2 letters at a time, order not important

so
RS
RT
ST

there are only 3 cases
in combination notation
C(3,2) = 3!/(2!1!) = 6/2 = 3

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