AMC 8 1994 Problem 24
AMC8 1994 年第 24 题
基本计数原理★★★★☆
Problem A 2 by 2 square is divided into four 1 by 1 squares. Each of the small squares is to be painted either green or red. In how many different ways can the painting be accomplished so that no green square shares its top or right side with any red square? There may be as few as zero or as many as four small green squares.
一个 2 × 2 的正方形被分成四个 1 × 1 的小正方形。每个小正方形要被涂成绿色或红色。共有多少种不同的涂色方式，使得没有绿色正方形与任何红色正方形共享其顶边或右边？小绿色正方形的数量可以从零到四个不等。
- A.4
- B.6
- C.7
- D.8
- E.16
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
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