A and B throw a pair of dice . If A throws 9 , find B's chance of throwing a higher number.
A throws 9 and B throws a higher number.
Thus, B throws 10, 11 or 12.
Total number of outcomes = 6×6 = 36
Number of favourable outcomes = 6 {(4,6) (5,5), (6,4), (5,6), (6,5), (6,6)}
∴P(B throwing a number greater than 9) =
=