Answer
$0.2$ (if red is one of the 4 colors)
$0$ otherwise
Work Step by Step
If red is not one of the 4 colors then probability of having a red ad is 0.
Now suppose red is one of the 4 colors, then
Let A be the event that the random color chosen is red
and B be the event that the selected font is the smallest one
We have to find $P(A\cap B')$
Since the colors are randomly selected the probability of getting each is $\frac{1}{4}$
Hence $P(A)=\frac{1}{4}$
Similarly the probability of each font getting chosen is $P(B)=\frac{1}{5}$
Now $P(A\cap B')=P(A)P(B')=P(A)[1-P(B)]=\frac{1}{4}[1-\frac{1}{5}]=\frac{1}{4}\cdot\frac{4}{5}=\frac{1}{5}$
