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A 3-digit number is called nice if it contains the digits 2 and 3, and the 2 appears before the 3.  For example, 243 is nice.  How many nice 3-digit numbers are there?

 Aug 9, 2020
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(123, 203, 213, 223, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 243, 253, 263, 273, 283, 293, 323, 423, 523, 623, 723, 823, 923) = Total = 27

 Aug 9, 2020

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