Four people each roll a four die once.
find probability that at least two people will Roll the same number.
a) 5/18
b) 13/18
c) 1295/1296
d) none of these.

• The first person rolls a die, and gets a number.
  
  The second person has a 5/6 chance of rolling a different number.
  
  The third person has a 4/6 chance of rolling a number different from those two.
  
  The fourth person has a 3/6 chance of rolling a number different from all three.
  
  The odds that no two will roll the same number is 5/6*4/6*3/6 = 5/18 = .
  
  That's the odds that no two will roll the same number, so the odds that two (or more) of them will roll the same number is 1-5/18 = 13/18
• 8 years agoHelpfull: Yes(2) No(0)
• ans a
  5/18
• 8 years agoHelpfull: Yes(0) No(1)