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How many 3-digit numbers contain exactly one 1 and exactly one 2?

 
 Nov 25, 2021
 #1
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+1

12*         8

1*2        8

21*        8

2*1        8

*12        7

*21       7

 

 

8+8+8+8+7+7 = 46

 
 Nov 26, 2021

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