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1 问题甲,乙,丙,丁4人进行篮球训练,互相传球,要求每人接球后立即传给别人,开始由甲发球,并作为第一次传球,第四次传球后,球又回到甲手中,问有多少种不同的传球方式? 2 求解上述传球问题别致有趣,主要考查分析问题和解决问题的能力.注意到传球人数和传球次数均不多,故可考虑用枚举法解之. 解法1 符合题设条件的传球方式可用树形图枚举如下:
1 Question A, B, C, and D4 are used for basketball training. They pass each other and ask each person to pass the ball to another person immediately after he receives the ball. They start serve by A and serve as the first pass. After the fourth pass, The ball is back in armor, asking how many different ways to pass? 2 Solving the pass problem is very interesting and interesting. It mainly examines the ability to analyze problems and solve problems. It also notes that there are not many passers and passes. Can be considered using the enumeration solution. Solution 1 The pass method that meets the problem-setting conditions can be enumerated as follows: