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How many 5-digit numbers have at least one 2 or one 3 or one 4 among their digits?

 Jun 14, 2021
 #1
avatar+121006 
+2

Here's  my attempt  :

 

Total  five -digit  integers =    (99999 - 10000  + 1)  =  90000

 

The ones  that   DON'T   contain  any of these  digits =

 

(6) (7) (7) (7) (7)   =  14406

 

Total  that DO contain    at least  one 2 or one 3 or one 4   among their  digits  =

 

90000  -  14406  =

 

75594

 

 

cool cool cool

 Jun 14, 2021
 #2
avatar+493 
+1

I know that CPhill is making an answer rn but take a look at an old one to have some hints: https://web2.0calc.com/questions/help-please_56105

 Jun 14, 2021

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