Mark buys a bag of cookies that contains 5 chocolate chip cookies, 6 peanut butter cookies, 5 sugar cookies and 4 oatmeal cookies. What is the probability that Mark reaches in the bag and randomly...

Mark buys a bag of cookies that contains 5 chocolate chip cookies, 6 peanut butter cookies, 5 sugar cookies and 4 oatmeal cookies.


What is the probability that Mark reaches in the bag and randomly selects a sugar cookie from the bag, eats it, then reaches back in the bag and randomly selects a chocolate chip cookie?





Give your answer as a fraction, or accurate to at least 4 decimal places.