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 one year ago
3 letters are dictated to 3 persons and an envelope is addressed to each of them,the letters are inserted into the envelopes at random so that each envelope contains exactly 1 letter.Find the probability that at least 1 letter is in its proper envelope?
 one year ago
3 letters are dictated to 3 persons and an envelope is addressed to each of them,the letters are inserted into the envelopes at random so that each envelope contains exactly 1 letter.Find the probability that at least 1 letter is in its proper envelope?

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JOYAL
 one year ago
Best ResponseYou've already chosen the best response.0the answer given is 2/3..

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1It is 1 2/(3*2*1) =11/3=2/3

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1probability that at least 1 letter is in its proper envelope= 1 probability that none of the letter is in its proper envelop= 1 2/(3*2*1) =2/3

JOYAL
 one year ago
Best ResponseYou've already chosen the best response.0@sauravshakya how did u get the probabily of geeting none?

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1No. of ways that none of the letter goes in its proper=2 Total no. of ways letter can be put in the enelope=3*2*1

JOYAL
 one year ago
Best ResponseYou've already chosen the best response.0@sauravshakya thank u...
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