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Omni-MATH / To celebrate 2019, Faraz gets four sandwiches shaped in the digits 2, 0, 1, and…

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problem

To celebrate 2019, Faraz gets four sandwiches shaped in the digits 2, 0, 1, and 9 at lunch. However, the four digits get reordered (but not flipped or rotated) on his plate and he notices that they form a 4-digit multiple of 7. What is the greatest possible number that could have been formed?

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