ganeshie8
  • ganeshie8
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?
Mathematics
jamiebookeater
  • jamiebookeater
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perl
  • perl
.
ikram002p
  • ikram002p
(1/20)^19 ?
perl
  • perl
If 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!

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More answers

ikram002p
  • ikram002p
:O
dan815
  • dan815
yes i agree!
dan815
  • dan815
total possibilties - prob of 1 wrong, and prob of 0 wrong
ganeshie8
  • ganeshie8
yeah that looks pretty neat, i guess then we can conclude the probability for exactly 19 letters putting in correct envelopes is 0 ?
dan815
  • dan815
oh wait lol everything is wring oops xD
anonymous
  • anonymous
@dan815 Could you help with this math question
dan815
  • dan815
everything is right*
ikram002p
  • ikram002p
xD
dan815
  • dan815
the probabilitly is 0!
perl
  • perl
oh its impossible :)
dan815
  • dan815
trying to trick us -.-
dan815
  • dan815
shame on this question
ganeshie8
  • ganeshie8
guess i was partially successful :P
dan815
  • dan815
lol
ikram002p
  • ikram002p
-.-
anonymous
  • anonymous
Hello
perl
  • perl
What about 19 or above
anonymous
  • anonymous
perl
  • perl
At least 19 correct
ikram002p
  • ikram002p
im half a sleep anyway xD
perl
  • perl
Then it would be 1/20!
anonymous
  • anonymous
You guys are so mean Please Help :( Could someone Help me http://openstudy.com/study#/updates/55912961e4b0428366270957
ganeshie8
  • ganeshie8
total 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
  • ikram002p
try 10 to be correct ?
Loser66
  • Loser66
Question: 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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