answer all questions with explanation and don't make random guess

Question If you roll a fair die twice and observe the numbers that face up, then the probability that the product of numbers is 15 given that the first number is odd: 1/9 1/6 None of these 1/18 Question * In a semiconductor manufacturing process, three wafers from a lot are tested, Each wafer is classified as pass or fail, Assume that the probability that a wafer passes the test is 0.8 and the wafers are independent. Then the probability distribution of the number of wafers from a lot that pass the test is: P(X=0) = 0.008, P(X=1) - 0.096, P(X-2) - 0.384, P(X=3) = 0.512 P(X=0) = 0.027. P(X-1) - 0. 189, P(X-2) - 0.441, P(X=3) = 0.343 None of these P(X=0) - 0.064, P(X-1) - 0.288. P(X-2) = 0.432, P(X=3) = 0.216