Posted by Anonymous on Thursday, March 7, 2013 at 1:15pm.
A fair dice is rolled 4 times. What is the probability that at least 2 of the numbers are the same? Use the format a/b.

probability  Count Iblis, Thursday, March 7, 2013 at 1:37pm
This is one minus the probability that none of the numbers are the same. If you roll the dice 4 times and all the numbers must be different then for the first throw there are 6 possible numbers, for the next 5, then there are 4 left, and finally you have 3 possible numbers, so there are:
6*5*4*3 possible dice throws such that each of the four yields a different number. The probability of this happening is thus:
6*5*4*3/6^4 = 5*4*3/6^3 = 5/18
So, the probability that 2 or more are the same is 15/18 = 13/18
Answer This Question
Related Questions
 Math Probability  Find the (theoretical) probability of a given event, assuming...
 probability  Two sixsided dice each have the numbers 1 through 6 on their ...
 statistics  If a dice is rolled one time, classical probability would indicate ...
 Probability  When two fair sixsided dice are rolled, there are 36 possible ...
 probabbility  Find the (theoretical) probability of a given event, assuming ...
 Math 141  A pair of fair 6sided dice is rolled. What is the probability that a...
 Probability  Two fair dice are rolled together. The probability that the sum ...
 math  A pair of fair dice is rolled. What is the probability of each of the ...
 Math 141  A pair of fair 6sided dice is rolled. What is the probability that a...
 College Stat  A pair of fair dice is rolled. What is the probability of each of...
More Related Questions