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Mathematics, 25.11.2021 08:00 tami5

In a lottery, 5 balls are selected from a bin of twenty balls numbered 1 through 20. (The order doesn't matter.) Professor Luckless always guesses a 5-ball combination that includes her lucky number 7, and does not include her unlucky number 13. How many different days can she play the lottery without repeating a 5-ball guess?

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