You roll a fair six sided die 10 times. What is the probability that you rol a 1 exactly two times given that you roll a 1 at least once?

Tom buys a bag of cookies that contains 9 chocolate chip cookies, 9 peanut butter cookies, 4 sugar cookies and 7 oatmeal raisin cookies. What is the probability that Tom randomly selects a chocolate chip cookie from the bag, eats it, then randomly selects another chocolate chip cookie? Express your answer as a reduced fraction.

A die is rolled twice. What is the probability of showing a 5 on the first roll and an even number on the second roll? Your answer is: 0

Suppose that the probability that a child living in an urban area in the United States is obese is 20%. If a social worker sees 15 children living in urban areas, what is the probability that 5 are obese? Enter response as .xxxx