P(prime on 1 throw) = P(2 or 3 or 5) = 3/6 = 1/2 P(prime on 1st toss AND prime on 2nd toss AND prime on 3rd toss) = P(prime on 1st toss)× P(prime on 2nd toss) × P(prime on 3rd toss) = (1/2)×(1/2)×(1/2) = 1/8 Edwin