<PRE><B>Question 818110</B>
how many three digit natural numbers can be named with each of the digits 5, 6, 7 and 8 used at most once
--------
1st digit: 4 ways
2nd digit: 3 ways
3rd digit: 2 ways
-----
Total = 4P3 = 4!/1! = 4*3*2 = 24 numbers
==============================================
Cheers,
Stan H.</PRE>