ANSWER
0.0593
Step-by-step explanation
The total number of cookies in the bag is,

When Warren takes the first cookie, the probability of it being a peanut butter cookie is 6 out of 23,

If the first cookie was peanut butter, when he takes the second cookie there are only 5 peanut butter cookies left and a total of 22 cookies, so the probability of that second cookie being peanut butter is,

So, the probability that Warren selects 2 peanut butter cookies from the bag is,

Hence, the probability that he takes 2 peanut butter cookies is 0.0593.