If you roll a six-sided die 12 times,what is the probability that you get all six numbers atleast once?
问题描述：
If you roll a six-sided die 12 times,what is the probability that you get all six numbers at
least once?
答
Total possibilities is 12P12= 479001600; and choose 6 out of 12 cases(order does matter)=>12P6= 665280,therefore, the probability should be 665280/479001600=1/720. Done