Chapter Four - 國立中興大學

b. Since the first two digits of the four digit PIN must be 3 and 5, respectively, and the third digit must be 1 or 7, the possible PINs are 3510 to 3519 and 3570 to 3579, a total of 20 possible PINs. Hence, P(thief succeeds) = 1 – P(thief fails) = 1 – 4.144 a. P(you must pay gambler) = P(gambler rolls at least one 6 … ................
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