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April 20, 2014

April 20, 2014

Posted by **Anonymous** on Thursday, November 17, 2011 at 10:47pm.

- math -
**MathMate**, Thursday, November 17, 2011 at 11:01pmNumber of choices for the first digit = 4

Since there cannot be repetitions,

Number of choices for the second digit = 3

similarly,

Number of choices for the third digit = 2

By the multiplication principle, the number of different 3-digit numbers with distinct digits that can be made from 4

= 4*3*2 = ?

- math -
**Steve**, Friday, November 18, 2011 at 12:56pmHowever, not all of those numbers are less than 500.

choices for 1st digit: 2 (3 or 4)

choices for 2nd digit: 3

choices for 3rd digit: 2

so, there are really only 12 possible numbers less than 500

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