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January 28, 2015

January 28, 2015

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

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 12:27amyou 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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