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We call a number odd looking if all of its digits are odd. How many four-digit odd-looking numbers are there?

 Apr 24, 2018
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We have 5 digits which are odd...

 

So....the number of "odd looking" 4 digit numbers is

 

(5)(5)(5)(5)  =  5^4   =  625

 

 

cool cool cool

 Apr 24, 2018

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