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To furnish a room in a model town home, an interior decorator is to select 2 chairs & 2 tables from a collections of chairs & tables in a warehouse that are all different from each other. If there are 5 chairs in the warehouse and if 150 different combinations are possible, how many tables are in the warehouse?
1. 6
2. 8
3. 10
4. 15
5. 30
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