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OpenStudy (anonymous):
How many combinations of two letters are possible from the letters U, A, and X?
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OpenStudy (anonymous):
UA,UX,AX. It'll be 3. If you mean like UA,UX,AU,AX,XU,XA then it'll be 6
OpenStudy (dumbcow):
3C2 = 3! /2! = 6/2 = 3
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