noboru wrote:
Mary and Joe are to throw three dice each. The score is the sum of points on all three dice. If Mary scores 10 in her attempt what is the probability that Joe will outscore Mary in his?
A. 24/64
B. 32/64
C. 36/64
D. 40/64
E. 42/64
To outscore Mary, joe has to score 11 or more.
first die-6
second die-4
third die- 1
if he gets 6 on the first die then he has no more options on first throw but in second die he may get 4 or 5 or 6 so total 3 outcomes
on the third die he has 6 options(1,2,3,4,5,6).
so
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