A bag contains 5 red marbles and 3 black marbles. Three marbles are drawn one by one without replacement. What is the probability that at least one of the three marbles drawn be black, if the first marble is red?

Explanation

To solve the problem step by step, we will calculate the probability that at least one of the three marbles drawn is black, given that the first marble drawn is red.

### Step 1: Understand the problem
We have a bag with:
- 5 red marbles
- 3 black marbles

We are drawing 3 marbles one by one without replacement. We need to find the probability that at least one of the three marbles drawn is black, given that the first marble drawn is red.
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