Andy C. answered • 08/23/17
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(4 choose 2) = 4!/(2!2!) = 4 * 3 * 2!/(2!2!) = 4 * 3/ 2 = 12/2 = 6
Jevgenijs A.
A/A?
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02/10/23
Schnoidz P.
I could only come up with 5 combinations. A /B, A /C, A /D, B /C, B/ D, C/ D. I don't see a 6th combination. Am I wrong?01/03/22