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How many four-digit, positive integers are there where each digit is a prime number?

 Jan 15, 2019
 #1
avatar+18754 
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Deleted.....

 Jan 15, 2019
edited by ElectricPavlov  Jan 15, 2019
 #2
avatar+102320 
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We only have these to choose from   [ 2, 3, 5 , 7 ]

 

We have 4  choices for each digit.....so

 

44 =     256   positive integers

 

 

cool cool cool

 Jan 15, 2019

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