Seven one-dollar bills are to be distributed among Lucia,Gomea,and Domingo so that each person recei
题目
Seven one-dollar bills are to be distributed among Lucia,Gomea,and Domingo so that each person received at least $1.
比较 the number of ways to distribute the bills so that at least one person recieves at least $3 和 the total number of ways to distribute the bills 的大小.
答案
题目：7张1美元的钞票分给lucia,gomea和domigo,每个人必须收到至少1美元.“比较”至少有一个人能拿到至少1美元的分配方法的数量“和”总共分配钞票的方法数量“的大小”答案：一样大.应为先每人发一块,保证每人至少1...
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