Nine-digit numbers
Determine the number of nine-digit numbers in which each of the digits 0 through 9 occurs at most once and in which the sums of the digits 1 through 3, 3 through 5, 5 through 7, and 7 to the 9th place are always equal to 10. Find the smallest and largest of these numbers.
Final Answer:
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combinatoricsarithmeticbasic operations and conceptsnumbersthemes, topicsGrade of the word problem
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