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ganeshie8
 one year ago
Stacy prepared 20 different letters to be sent to 20 addresses. For each letter she prepared an envelope with its correct address. If the 20 letters to be put in to 20 envelopes at random, what is the probability that exactly 19 letters will be put in to the envelope with the correct address?
ganeshie8
 one year ago
Stacy prepared 20 different letters to be sent to 20 addresses. For each letter she prepared an envelope with its correct address. If the 20 letters to be put in to 20 envelopes at random, what is the probability that exactly 19 letters will be put in to the envelope with the correct address?

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perl
 one year ago
Best ResponseYou've already chosen the best response.2If 19 letters are in the correct envelopes, then the last letter must also be in the correct envelope. The probability of all 20 envelopes in the correct order is 1/20!

dan815
 one year ago
Best ResponseYou've already chosen the best response.2total possibilties  prob of 1 wrong, and prob of 0 wrong

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3yeah that looks pretty neat, i guess then we can conclude the probability for exactly 19 letters putting in correct envelopes is 0 ?

dan815
 one year ago
Best ResponseYou've already chosen the best response.2oh wait lol everything is wring oops xD

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@dan815 Could you help with this math question

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3guess i was partially successful :P

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Could someone Help me http://openstudy.com/study#/updates/55912961e4b0428366270957

ikram002p
 one year ago
Best ResponseYou've already chosen the best response.2im half a sleep anyway xD

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You guys are so mean Please Help :( Could someone Help me http://openstudy.com/study#/updates/55912961e4b0428366270957

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3total permutations : 20! permutations in favor : 1 so yeah.. 1/20! on cursory thinking, this doesn't look like a binomial distribution, so other cases can get complicated hmm

ikram002p
 one year ago
Best ResponseYou've already chosen the best response.2try 10 to be correct ?

Loser66
 one year ago
Best ResponseYou've already chosen the best response.0Question: you have 20 envelopes and 20 letters; 19 are correct matching. Is it not that 20 are matching?? Since 19 right, how can the rest is wrong?
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