Objective
In this challenge, we practice calculating the probability of a compound event. We recommend you review today's Probability Tutorial before attempting this challenge.

Task
There are urns labeled , , and .

• Urn contains red balls and black balls.
• Urn contains red balls and black balls.
• Urn contains red balls and black balls.
  
  

One ball is drawn from each of the urns. What is the probability that, of the balls drawn, are red and is black?