Homework Help: math

Posted by Anonymous on Thursday, February 7, 2013 at 9:51pm.

A locker combination has three nonzero digits, and digits cannot be repeated. The first two digits are 1 and 2. What is the probability that the third digit is 3?

math (incomplete) - PsyDAG, Friday, February 8, 2013 at 4:35pm
How many total numbers are available in the combination?

1/(Total-2) = ?

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