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How many two-digit numbers have a tens digit that is greater than the units digit?

 Apr 17, 2020
 #1
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10

20 21

30 31 32     we can see a pattern here

 

 

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = ..........

 Apr 17, 2020

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