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What is the greatest four-digit integer that meets the following three restrictions?

1- All of the digits are different.

2- The greatest digit is the sum of the other three digits.

3- The product of the four digits is divisible by 10 and not equal to zero.

 Sep 2, 2020
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The greatest 4-digit number that meets all 3 conditions = 8521

 Sep 2, 2020

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