Four-digit numbers
Find four-digit numbers where all the digits are different. For numbers, the sum of the third and fourth digits is twice the sum of the first two digits, and the sum of the first and fourth digits is equal to the sum of the second and third digits. The digit 0 must not be in the first position of the number. How many are there?
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algebrabasic operations and conceptsnumbersGrade of the word problem
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