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?

   Help (a):

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

   More Help (a):

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

2. A red or a green marble?

   Help (b):

   See part (a).

   Answer (b):

   $\frac{11}{16}$

3. An orange marble?

   Help (c):

   See part (a).