【GMAT考满分数学PS题库】A building has x floors. The top floor has only on_真题_答案_解析 GMAT考满分官网

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A building has x floors. The top floor has only one room. The number of rooms per floor below is twice that of the floor above it. What is the number of rooms on the bottom floor?

A2
B$$2^x$$
C$$2^{x-1}$$
D$$2^{x+1}$$
E$$2^{x+2}$$

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正确答案: C

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