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This is how Edward's Lotteries work. Fir...

This is how Edward's Lotteries work. First, 9 different numbers are selected. Tickets with exactly 6 of the 9 numbers randomly selected are printed such that no two ticket have the same set of numbers. Finally, the winning ticket is the one containing the 6 numbers drawn from the 9 numbers randomly. There is exactly one winning ticket in the lottery system. How many tickets can the lottery system print?

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