Trevor buys a bag of cookies that contains 7 chocolate chip cookies, 9 peanut butter cookies, 4 sugar cookies and 8 oatmeal raisin cookies. What is the probability that Trevor randomly selects a peanut butter cookie from the bag, eats it, then randomly selects another peanut butter cookie? Express your answer as a reduced fraction.
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Box 1: Enter your answer as a reduced fraction (like 5/3, not 10/6) or as an integer (like 4 or -2)
Do not enter mixed numbers
Enter DNE for Does Not Exist, oo for Infinity