sat数学.题目看不懂..Tim wrote a seven-digit phone number on a piece of paper.He later tore the paper accidentally and the last two digit were lost．What is the maximum number of arrangements of two digits,using the digits 0 through 9,that he

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sat数学.题目看不懂..Tim wrote a seven-digit phone number on a piece of paper.He later tore the paper accidentally and the last two digit were lost．What is the maximum number of arrangements of two digits,using the digits 0 through 9,that he

sat数学.题目看不懂..Tim wrote a seven-digit phone number on a piece of paper.He later tore the paper accidentally and the last two digit were lost．What is the maximum number of arrangements of two digits,using the digits 0 through 9,that he
sat数学.题目看不懂..
Tim wrote a seven-digit phone number on a piece of paper.He later tore the paper accidentally and the last two digit were lost．What is the maximum number of arrangements of two digits,using the digits 0 through 9,that he could use in attempting to reconstruct the correct phone number?

sat数学.题目看不懂..Tim wrote a seven-digit phone number on a piece of paper.He later tore the paper accidentally and the last two digit were lost．What is the maximum number of arrangements of two digits,using the digits 0 through 9,that he
Tim在一张纸上记下了一个七位数的电话号码.后来他不小心撕破了这张纸,号码的最后两位数弄没了.问用数字0到9所能组成的两位数的组合最多有多少,使他能够用来恢复正确的电话号码?
答案肯定是100.0到9任选两个的组合,简单的说就是10x10=100.用公式就是P(1 10)xP(1 10)=100.如果用罗列的办法可知,（00~09）、（10~19）、...(80~89)、（90~99）,一共100种组合.

大概意思是说，汤姆写了一个七位数的电话号码在一张纸上，过了一会儿他不小心把纸撕坏了，导致号码的最后两位不见了。问你从0到9最多有多少组合方式，能让他利用在重建正确的电话号码上。
大概要用到排列组合的方式吧。

Tim在一张纸上写了7位电话号码。之后，他偶然间把这张纸撕了，所以最后2个数丢了。从0到9（这十个数字），他尝试重新构造出正确电话的，最多有几种排列组合
就是0到9的排列组合问题
哦，确实是100，简单点说：
确定两位数中的第一位：有10种选择，0-9哪个都行；
确定两位数中的第二位：也有10种选择，0-9哪个都行；
可以重复，如00，55...

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Tim在一张纸上写了7位电话号码。之后，他偶然间把这张纸撕了，所以最后2个数丢了。从0到9（这十个数字），他尝试重新构造出正确电话的，最多有几种排列组合
就是0到9的排列组合问题
哦，确实是100，简单点说：
确定两位数中的第一位：有10种选择，0-9哪个都行；
确定两位数中的第二位：也有10种选择，0-9哪个都行；
可以重复，如00，55

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