There are $\binom{20}{2} = 190$ ways to choose two members of the group. There are $12$ ways to choose a boy and $8$ ways to choose a girl for a total of $12 \cdot 8 = 96$ ways to choose a boy and a girl.  This means that there is a $\dfrac{96}{190} = \boxed{\dfrac{48}{95}}$ chance that the two random members of the group are a boy and a girl.
A club has 20 members, 12 boys and 8 girls.  Two of the members are chosen at random.  What is the probability that a boy and a girl are chosen?
{'answer': '\\dfrac{48}{95}', 'subject': 'Counting & Probability', 'level': 3, 'unique_id': 'test/counting_and_probability/690.json'}