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题库 / Prep2007E1-PS-157
To furnish a room in amodel home, an interior decorator is to select 2 chairs and 2 tables from acollection of chairs and tables in a warehouse that are all different from eachother. If there are 5 chairs in thewarehouse and if 150 different combinations are possible, how many tables arein the warehouse?
6
8
10
15
30
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