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March 28, 2017

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Need Answer to the Following Please:

Using the 9 digits, 1, 2, 3, 4, 5, 6,7, 8 and 9 you can arrange four different digits to form a four-digit number that is NOT divisible by 7. The digits 1238 cannot be arranged to create a four-digit number that is divisible by 7. The digits 1389 also cannot be arranged to form a four-digit number that is divisible by 7. Find one additional set (not 1238 or 1389) of four different digits that is not divisible by 7. Provide the digits to form the smallest four digit value.

Please explain. Thank You

  • MATH - ,

    how about 1245 or 3489, or ...

    pick any four digits. If the number is divisible by 7, raise a digit by less than 7, and there will now be a nonzero remainder.

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