Question 1031980
0 twos is (5/6)(5/6)(5/6)=125/216.
1 two is (1/6)(5/6)(5/6)*3, because there are 3 ways to do this=75/216
two twos is (1/6)(1/6)(5/6)*3=15/216
three twos is (1/6)^3=1/216
They add to 216/216, or 1.