Objective
In this challenge, we practice calculating probability.
Task
contains red balls and black balls.
contains red balls and black balls.
One ball is drawn from the , and balls are drawn from . Find the probability that balls are black and ball is red.
Output Format
In the editor below, submit your answer as Plain Text in the form of an irreducible fraction , where and are both integers.
Your answer should resemble something like:
3/4
(This is NOT the answer, just a demonstration of the answer format.)