## Day 2: Basic Probability Puzzles #3

**Objective**

In this challenge, we practice calculating probability.

**Task**

There are urns: , 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 urn. What is the probability that the balls drawn consist of red balls and black ball?

**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.)