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Without repetition, how many for 4 digits numbers you can form with 1,2,3,4,5,6,7 which are divisible by 5

 Feb 23, 2020
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The only way that a  number is divisible  by  5 is if it ends in  0  or  5

 

So..........we  must have  the form

 

___   ____    ____    5

 

We  have  6  other digits  to  choose from....so.....the total possible  4 digit numbers  divisible by 5  with no digits repeated  =

 

6 choices   * 5 choices  * 4 choices   =

 

 

120

 

 

cool cool cool

 Feb 23, 2020

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