Why marble bag has four marbles one is green and one is red one is blue and one is yellow which is a simple event?

In probability, a simple event refers to an individual outcome from a sample space. In the case of the marble bag, each color represents a distinct simple event: drawing a green marble, a red marble, a blue marble, or a yellow marble. Each of these outcomes cannot be broken down further and occurs independently of the others, making them simple events. Thus, selecting any one of these colored marbles from the bag is considered a simple event.