神马作文网GMAT数学 Tanya prepared 4 different letters to be sent to 4 di
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GMAT数学 Tanya prepared 4 different letters to be sent to 4 different addresses.
Tanya prepared 4 different letters to be sent to 4 different addresses.For each letter,she prepared an envelope with its correct address.If the 4 letters are to be put into the 4 envelopes at random,what is the probability that only 1 letter will be put into the envelope with its correct address?
我不需要翻译，只想知道本题的答案是什么。
Tanya prepared 4 different letters to be sent to 4 different addresses.For each letter,she prepared an envelope with its correct address.If the 4 letters are to be put into the 4 envelopes at random,what is the probability that only 1 letter will be put into the envelope with its correct address?
我不需要翻译，只想知道本题的答案是什么。
我算的是1/3 待讨论
设四封信是abcd,四个信封是ABCD.
先假设A里放a(是正确的）,bcd都放在错误的信封里,有两种情况（CDB,DBC)
这样的情况有A里放a,B里放b,C里放c,D里放d 四种情况 是2*4=8
答案就是：8/4!=1/24=1/3
祝考试顺利!我也马上就要考了~
设四封信是abcd,四个信封是ABCD.
先假设A里放a(是正确的）,bcd都放在错误的信封里,有两种情况（CDB,DBC)
这样的情况有A里放a,B里放b,C里放c,D里放d 四种情况 是2*4=8
答案就是：8/4!=1/24=1/3
祝考试顺利!我也马上就要考了~
GMAT数学 Tanya prepared 4 different letters to be sent to 4 di
The world will be different,and we will have to prepared to
the world will be different,and we will have to be prepared
What does need to be prepared barbecue ?
be prepared for Back to school
you must be prepared to change dictions.
please arrange to have three letters of recommendation sent
The wounded ------- to be sent to hospital.
Have you got letters to send?跟Have you got letters sent?
请问be ready to 和be prepared for 怎么辨析,
sth.need prepared sth.need be prepared sth.need to be prepar
She must be sent (must sent) to the hospital