Question

What formula do I use to get my answer? I’m getting 1/13, but my answer is incorrect. Thank you.

Answer 1

We will have the following:

First, the probability of getting the first t-shirt white will be:

$p_1=\frac{4}{9}$

And the probability of getting the second t-shirt white will be:

$p_2=\frac{3}{8}$

Now, the probability of getting the two white t-shirts one after the other will be:

$\begin{gathered} p_3=p_1\ast p_2\Rightarrow p_3=\frac{4}{9}\ast\frac{3}{8} \\ \\ \Rightarrow p_3=\frac{1}{6} \end{gathered}$

So, the probability of getting the two white t-shirts one after the other is 1/6.