Who is asking: Parent
To play a game a dice is rolled to see who plays first. four players are going to play the game. what is the probability that at least two people roll the same number?
P(least 2 people roll the same #)=number of player/total outcome
P = 4!/4C2 = 24/4C2 = 4 the answer is 40%
Use the negation. Consider the negation of the event
"At least two people have the same numbers",
it will be
"All 4 players have different numbers".
The probability of this event is:
Now, the event we are interested in has the probability
1 - 5/18= 13/18.