### Home > GB8I > Chapter 10 Unit 11 > Lesson INT1: 10.2.3 > Problem 10-110

10-110.

Ambrose has a bag of marbles with *R* red marbles, *G* green marbles, *B* blue marbles, and *Y* yellow marbles. Write an expression for each of the following situations.

The probability of selecting a yellow marble.

The probability of selecting a blue or green marble.

Add the blue and green together.

The probability of selecting a purple marble.

How many purple marbles are there?