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- Practice
- Artificial Intelligence
- Probability & Statistics - Foundations
- Day 2: Basic Probability Puzzles #4

# Day 2: Basic Probability Puzzles #4

# Day 2: Basic Probability Puzzles #4

**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.)