Seven-segmet
Helen is amused that he punched a calculator (seven-segment display) number and used only digits 2 to 9. Some numbers have the property that She again gave their image in the axial or central symmetry some number.
Determine the maximum number of three-digit numbers with the following properties.
Determine the maximum number of three-digit numbers with the following properties.
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combinatoricsbasic operations and conceptsnumbersGrade of the word problem
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