Mariah buys a bag of cookies that contains 4 chocolate chip

Last updated: 7/14/2022

Mariah buys a bag of cookies that contains 4 chocolate chip cookies, 6 peanut butter cookies, 9 sugar cookies and 4 oatmeal cookies. What is the probability that Mariah reaches in the bag and randomly selects an oatmeal cookie from the bag, eats it, then reaches back in the bag and randomly selects a chocolate chip cookie?