What's the probability of rolling less than or equal to 7 on two fair regular number cubes?
1 Answer
Apr 24, 2017
Explanation:
I'm going to assume we're working with 2 fair, standard, 6-sided dice.
Let's take a look at all possible rolls:
Out of the 36 total possible combinations, 15 are greater than seven (which means that
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#P("sum of 2 number cubes" <=7)=21/36=7/12# -
#P("sum of 2 number cubes" <=7)=1-P("sum of 2 number cubes" >7)=1-15/36=21/36=7/12#