After the typist writes 12 letters and addresses 12 envelopes, she inserts the letters randomly into the envelopes (1 letter per envelope). What is the probability that exactly 1 letter is inserted in an improper envelope?

• Zero.
  
  If one letter is in wrong envelope, one other letter must also be in wrong envelope. So zero is the probability that exactly 1 letter is inserted in an improper envelope.
• 14 years agoHelpfull: Yes(91) No(3)
• 0.
  If exactly one letter is placed i the wrong envelope, the original letter for the envelope must also be misplaced. Hence, the event cannot occur. So, probability is zero
• 14 years agoHelpfull: Yes(19) No(3)
• Ans is 0.If we insert one letter in improper envelope then we must insert at least one another letter in improper envelope.So it is not possible to insert only one letter in improper envelope.........So probability is zero.......
• 14 years agoHelpfull: Yes(16) No(1)
• Ans is zero
  since it is not possible to keep one letter in improper envelope
• 14 years agoHelpfull: Yes(12) No(1)
• 0
• 14 years agoHelpfull: Yes(8) No(1)
• 0 since only 1 letter cant be inserted in an improper way
• 14 years agoHelpfull: Yes(4) No(1)
• ans is zero
• 10 years agoHelpfull: Yes(0) No(0)
• 0 is d ans
• 9 years agoHelpfull: Yes(0) No(0)
• 0 : as one letter is in wrong envelope
  
• 9 years agoHelpfull: Yes(0) No(0)
• If one letter is misplaced then one other letter is also misplaced so probability of one letter misplaced is ''0"
• 8 years agoHelpfull: Yes(0) No(0)
• all letters exacat envelope probability= 1
  exactly one letter is inserted in improper is not possible =0
  atleast 2 letter is possible
  
• 8 years agoHelpfull: Yes(0) No(0)