题目信息
If $$\frac{1}{2}$$ of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 4 strokes?
A:$$\frac{15}{16}$$
B:$$\frac{7}{8}$$
C:$$\frac{1}{4}$$
D:$$\frac{1}{8}$$
E:$$\frac{1}{16}$$
参考答案及共享解析

共享解析来源为网络权威资源、GMAT高分考生等; 如有疑问,欢迎在评论区提问与讨论
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已选答案:
正确答案:
A:$$\frac{15}{16}$$
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