Question 479193
<pre>
Choose the 1st digit any of 4 ways: 3, 4, 5, or 6
Choose the 2nd digit any of 6 ways: any of the six which 
you didn't choose for the 1st digit.
Choose the 2nd digit any of 5 ways: any of the five which 
you didn't choose for the 1st or 2nd digits.

Answer: 4󬝱 = 120 ways.


Edwin</pre>