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Mathematics 11 Online
OpenStudy (knov):

there are 20 tourists at the train station. There are only 20 tickets left to buy. and 12 of them is upper side and 6 of them is lower side bed. 4 of tourists doesn't want to buy ticket that is lower side. and 5 tourists doesn't want to buy ticked that is upper side. How many combinations there are to arrange them. oRDER PLACEMENT IS IMPORTANT.

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