+0  
 
0
2350
1
avatar+610 

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

 Apr 20, 2018
edited by gueesstt  Apr 20, 2018
 #1
avatar+118587 
-1

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

 

How many 5 digit numbers are there

99999-10000+1= 90000     or

9*10*10*10*10=90000

 

How many are there that do not have a 2 or a 3 as any digit.

7*8^4 = 28672  

 

So how many of them DO have at least one 2 or one 3 

90000-28672 = 61328

 

 

Edited after my answer was questioned.   We agree now. 

 Apr 20, 2018
edited by Melody  Dec 19, 2019
edited by Melody  Dec 19, 2019

4 Online Users

avatar
avatar
avatar