30 days are in septmbr;april;june ,novmbr.some months are of 31 days .a month s chosen at random .thn its probability Of xactly 3 days less th max 31??

• The month should be february(28 days)
  Here we have to take leap year into consideration
  So in 4 yrs prob of selecting a 28 day month=3/48(As a 28 day feb occurs only thrice in 4 years(48 months))
• 11 years agoHelpfull: Yes(19) No(4)
• for 1 year it will be 1/12;for 4 years it will be 3/48=1/16.
  
• 11 years agoHelpfull: Yes(7) No(1)
• sorry.........
  ans =1/7 because there 7 months have 31 days.3so that probability of 3 less day from 31 is 1/7 for one year and for 4 year that is 3/28
• 11 years agoHelpfull: Yes(2) No(1)
• why is it not 1/12?
• 11 years agoHelpfull: Yes(1) No(2)
• i think ans is 17 .
  because there are only 7 months having 31 days so that to random select 3 day less exactly from 31 in one probability is 17 and in 4 year it is 328.
• 11 years agoHelpfull: Yes(0) No(4)