### Home > MC2 > Chapter 2 > Lesson 2.2.1 > Problem2-50

2-50.

Thu has a bag with $7$ green marbles, $5$ blue marbles, and $4$ red marbles. For each part below, if the marble selected is replaced before the next marble is drawn, what is the probability that she will draw. .

1. A red marble?

Remember that probability can be written as a fraction:
$\frac{\text{\# of marbles we're looking for}}{\text{Total \# of marbles}}$

How many red marbles are there?
How many total marbles?

2. A red or a green marble?

See part (a).

$\frac{11}{16}$

3. An orange marble?

See part (a).

Explore the problem with the eTool below.
Click the link at right for the full version of the eTool: MC2 2-50 HW eTool