If I have a bag filed with 6 marbles, 2 blue marbles, and 4 yellow marbles, and I had to pick one from the bag, what is my sample space?

To determine your sample space, we need to identify all possible outcomes when you pick a marble from the bag. In this case, you can either pick a blue marble or a yellow marble. Therefore, the sample space consists of these two possibilities: blue marble (B) and yellow marble (Y).

So, your sample space is {B, Y}.