A = {0, 1, -3, 6, -8}
B = {-1, 2, -4, 7}
If a is a number that is randomly selected from Set A, and b is a number that is randomly selected from Set B, what is the probability that ab > 0?
Choose the correct choice from the following choices.
A) 1/4
B) 1/3
C) 2/5
D) 4/9
E) 1/2
For the product of 2 numbers to be positive either both of them must be positive or both of them must be negative:   P(positive, positive) = 2/5*2/4 = 4/20;   P(negative, negative) = 2/5*2/4 = 4/20.   P = 4/20 + 4/20 = 8/20 = 2/5.   Answer: 2/5.
<result>C</result>
A = {0, 1, -3, 6, -8}
B = {-1, 2, -4, 7}
If a is a number that is randomly selected from Set A, and b is a number that is randomly selected from Set B, what is the probability that ab > 0?