Mathematics, 15.12.2021 01:00 crystalhoff9419

In a four-digit number, the sum of the digits of the thousands and tens is equal to 4. The sum of the digits of the hundreds and the units is 15, and the digit of the units exceeds by 7 the digit of the thousands. Among all the numbers satisfying these conditions, find the number the sum of the product of whose digit of the thousands by the digit of the units and the product of the digit of the hundreds by that of the tens assumes the least value.

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In a four-digit number, the sum of the digits of the thousands and tens is equal to 4. The sum of th...