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1.Of all the four-digit positive integers containing only digits from the set {2,4,6,8} what fraction of them have at least one of their digits repeated?
 

 Apr 19, 2021
 #1
avatar+31536 
+2

I THINK:

Any digit repeated    4 x 4 x 4 x 4 =  256   four-digit numbers possible

No repeats    4 x 3 x 2 x 1     = 24          256 -24 = 232 with repeats

 

232/256 = 29/32   

 Apr 19, 2021
 #2
avatar+321 
0

that's right thank you!!

itachiuchihakujo  Apr 19, 2021

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