How many integers greater than 5400 and less than 10000 have both of the following properties: - digits are distinct - digits 2 and 7 do not occur. I got that there are 1680 integers from 0-9999 and 960 integers from 0-5400 with those two properties so using the subtraction principle then there are 720 from 5401-9999 with those two properties.

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.