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Find the number of positive integers that satisfy both the following conditions:
* Each digit is a $1$ or a $3$ or a $5$
* The sum of the digits is $10$

 Jan 23, 2024
 #1
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3331  =    4! / 3! =  4 integers

5311  =    4! / 2! =  12 integers

 

16 integers

 

cool cool cool

 Jan 24, 2024

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