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-5
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18
avatar+-291 

How many distinct three-digit numbers can be written with the digits $1$, $2$, $3$ and $4$ if no digit may be used more than once in a three-digit number?

 Apr 1, 2020
 #1
avatar+210 
+1

Hint: Use constructive counting.

 Apr 1, 2020
 #2
avatar+210 
+1

This is very similar to some of the other problems you have asked; try to make a connection so you know how to solve similar problems.

Impasta  Apr 1, 2020
 #18
avatar+111321 
+2

This  is  = the number  of ordered sets  formed  by  taking  3 objects  from 4  =

 

P(4,3)  =   24  sets

 

cool cool cool

 Apr 1, 2020

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