Three fair six sided dice rolled.
Total ways =6*6*6=216
d) probability that sum of all three dice is exactly 10
Sum =10
(1,3,6) --->it can be done in 3*2*1= 6 ways
(1,4,5) ---> it can be done in 6 ways
(2,2,6) ---> it can be done in 6/2= 3 ways
(2,3,5) ---> it can be done in 6 ways
(2,4,4) .---> it can be done in 6/2= 3 ways
(3,3,4) ---> it can be done in 3 ways
Total =6+6+3+6+3+3=27 ways
Probability that sum is exactly 10 is 27/216 = 1/8
Probability=0.125
e) probability that sum is less than 10
Sum={3,4,5,6,7,8,9}
Sum=3 --> (1,1,1) --->1 way
Sum=4 --->(1,1,2) --->3 ways
Sum=5 ---->(1,1,3) (1,2,2) ---> 3+3= 6 ways
Sum=6 ---> (1,1,4) (1,2,3) (2,2,2) ---> 3+6+1=10 ways
Sum =7 ---> (1,1,5) (1,2,4) (1,3,3) (2,2,3) ---> 3+6+3+3 =15 ways
Sum=8 ---> (1,1,6) (1,2,5) (1,3,4) (2,2,4) (2,3,3)=3+6+6+3+3=21 ways
Sum=9 ---> (1,2,6) (1,3,5) (1,4,4) (2,2,5) (2,3,4) (3,3,3)= 6+6+3+3+6+1=25 ways
Total number of ways = 1+3+6+10+15+21+25=81
Probability= 81/216= 0.375
f) probability that sum is greater than 10
Probability= 1- p(sum less than equal to 10)= 1- 0.125-0.375
Probability= 1-0.5=0.5
Probability that sum is greater than 10 is 0.5
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