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Pick two or fewer different digits from the set $\{1, 3, 6, 7\}$ and arrange them to form a number. How many prime numbers can we create in this manner?

 Apr 1, 2020
 #1
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Primes   = 10

 

One digit  = 3, 7

Two digit  =  13, 17, 37, 67, 73, 71, 61, 31

 

 

cool cool cool

 Apr 1, 2020

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