Lunch
Seven classmates go every day for lunch. If they always come to the front in a different order, will it be enough school year to take off all the possibilities?
Correct answer:
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Would you like to compute the count of combinations?
You need to know the following knowledge to solve this word math problem:
combinatoricsarithmeticbasic operations and conceptsnumbersUnits of physical quantitiesGrade of the word problem
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