Posted by jenny on Saturday, May 19, 2012 at 10:55pm.
If no digit appears more than once, how many 2digit numbers can be formed from the digits 1, 3, 5, and 7?

algebra 2  Steve, Saturday, May 19, 2012 at 11:12pm
P(4,2) = 12

algebra 2  jenny, Saturday, May 19, 2012 at 11:28pm
Thank you
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