Choose the correct answer 1. A committee of two chemists and one physicist can be formed from 4 chemists and 3 physicists is (a) 6 (b) 12 (c) 18 (d) 36 2. If the random variable X takes the value of the group: {1,3,4). Which of the following functions is a probability function of the variable X (a) f(x) = (c) f(x) == 13 (b) f(x)=- x+9 12 (d) f(x)=x-3 3. In how many different ways can, a true-false test consisting of 9 questions, be answered? (a) 2x9 (b) 2 (c) 92 4. If A and B any two events in S, then P(AUB) equals to (a) P(A) P(B) (c) P(A) + P(B) (d) C₂ (b) P(A) + P(B)-P(A)P(B) (d) P(B) + P(An Bº) 5. If the events B1, B2, ..., Bk constitute partitions of the sample space S such that P(B) 0,1,2,..., k, then for any event A of S; P(A) is equal to FORM B 1 (a) = P(A)P(A|B) (c) P(B)P(A|B) (b) P(B)P(BA) (d) = P(A)P(B)