After the typist writes 12 letters and addresses 12 envelopes she inserts the letters randomly into the envelopes(one letter per envelope). what is the probability that exactly one letter is inserted in an improper envelope?
a)0 b)11/12 c)1/12
d)12/212

• Answer is Zero, bcoz it is not possible to insert only one letter into improper evelope. Suppose one letter inserted into any improper envelope so there will be an another improper evelope for improper letter.Dats y probability is Zero.
• 13 years agoHelpfull: Yes(9) No(1)
• a) o
  bcoz only one letter can't be in wrong envelope others will also be in wrong envelope
• 13 years agoHelpfull: Yes(9) No(0)
• 0 is ans.
• 13 years agoHelpfull: Yes(4) No(1)
• a)0
  exactly 1 letter cant be inserted in an improper envelope, so prob is 0
• 13 years agoHelpfull: Yes(3) No(0)
• a)0
  if one letter is inserted in a wrong envelope, the letter which originally belonged to the envelope must have been inserted in a wrong envelope as well.
• 13 years agoHelpfull: Yes(3) No(0)
• zero...
• 13 years agoHelpfull: Yes(3) No(0)
• Ans is Zero. Question is asking whether there is any chances of one letter getting inserted in an improper envelope, but there can-not be onr case as if one gets improper there is another letter who will be inserted in the improper envelope too...
• 13 years agoHelpfull: Yes(3) No(0)
• a
• 13 years agoHelpfull: Yes(1) No(0)
• a)0
• 13 years agoHelpfull: Yes(1) No(0)
• a)0
• 13 years agoHelpfull: Yes(1) No(0)
• The probability will be 0 as P(ans)=1-P(ans)'
  where ans =event for exactly 1 letter is inserted in an improper envelope
  we get p(ans)'=1 hence p(ans)=1-1=0
• 13 years agoHelpfull: Yes(1) No(0)
• 0 because if one letter is inserted in wrong envelope then the other must also be inserted in a wrong envelope.Hence, th eprobability of exactly one letter to be inserted in wrong envelope is 0.
• 12 years agoHelpfull: Yes(0) No(0)
• 0 cause only one letter can't be wrong in envelop
• 8 years agoHelpfull: Yes(0) No(0)