Posted by **jenny** on Saturday, May 19, 2012 at 10:55pm.

If no digit appears more than once, how many 2-digit 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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