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Omni-MATH / For what single digit n does 91 divide the 9-digit number 12345n789?

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problem

For what single digit nn does 91 divide the 9-digit number 12345n78912345 n 789?
Plain-text mathematical notation (without MathML)
For what single digit n does 91 divide the 9-digit number 12345n789?
Original LaTeX notation
For what single digit $n$ does 91 divide the 9-digit number $12345 n 789$?

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