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标题: 两个问题 [打印本页]

作者: lnlynn 时间: 2002-11-15 20:16 标题: 两个问题

1。X=Y+10
X大于（Y+10）
这两个表达式英文如何表示？

2。一堆球，各种颜色，求有多少种取法，若不放回可用组合数算，若放回是不是就不能用组合数算了？[em08][em08][em08]

作者: abelianrose 时间: 2002-11-15 21:14

若放回, you need not the use the combinatorics . Cause everytime you pick one
ball from N balls, there are still N choices avaliable(unless there is some restriction). You can simply multiple the numbers.

作者: lnlynn 时间: 2002-11-16 21:03

thank you,abelianrose!
can anyone answer my first question,i am very nervous,i will test next monday!

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