Math

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Teng is designing a house and in each room he can choose from tiles, floorboards, or carpet for the floor.
a. How many combinations of flooring materials are possible if her designs a 2 room studio?
b. How many combinations are possible for a 3 room apartment?
c. How many combinations for a 4 room flat?
d. How many combinations for an "n" room house?
e. He finally decides on an 8 room house. How many different combinations are possible?

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