After typist types 12 letters and adresses 12 envelops , she inserts the letter randomly into envelops.wt is probability tht exactly 1 lettr is inserted in improper envelop??

• when exactly 1 letter is to inserted into improper envolpe...it indiactes that 11 envelpes have been correctly assigned to proper addresss...hence 12th will be inserted into 12th address...so probablity in this case of "exactly one" is 0
• 11 years agoHelpfull: Yes(13) No(0)
• 0 is the answer. as 2 letter can be misplaced. if 1 is misplaced another letter is also misplaced
• 11 years agoHelpfull: Yes(6) No(0)
• ans is zero...
  because 1 single letter can nevr be in wrong envelops.if any 1 is put in wrong one then automaticaly other one (wherein we have alrdy put 1 letr) will hav to be put in some wrong envelope so minm wrong is 2..
  so here ans =zero
• 11 years agoHelpfull: Yes(5) No(0)
• 0 improper envelopes r there
  
• 11 years agoHelpfull: Yes(0) No(0)
• the answer is 0
• 11 years agoHelpfull: Yes(0) No(1)
• 0, atleast 2 have to be misplaced
• 11 years agoHelpfull: Yes(0) No(0)