AMC 8 2002 Problem 21

AMC8 2002 年第 21 题

概率★★★★☆

Harold tosses a coin four times. The probability that he gets at least as many heads as tails is

掷一枚镍币掷了四次，那么他得到正面的次数至少和反面一样多的概率是多少？。 Problem 22 Six cubes, each an inch on an edge, are fastened together, as shown. Find the total surface area in square inches. Include the top, bottom and sides. 如下图所示，6 个边长为 1 的正方体被粘在一起。请求出这个立体的总表面积，包含顶面，底面和侧面（单位：平方英寸）。

A. $\displaystyle \frac{5}{16}$
B. $\displaystyle \frac{3}{8}$
C. $\displaystyle \frac{1}{2}$
D. $\displaystyle \frac{5}{8}$
E. $\displaystyle \frac{11}{16}$

正确答案 · Correct Answer

解析 · Solution

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