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Levi buys a bag of cookies that contains 6 chocolate chip cookies, 9 peanut butter cookies, 8 sugar cookies and 8 oatmeal cookies. What is the probability that Levi reaches in the bag and randomly selects 2 peanut butter cookies from the bag

Respuesta :

mhanifa

Answer:

12/155

Step-by-step explanation:

Total number of cookies:

  • 6+9+8+8= 31

Probability of getting a peanut butter cookie at first attempt is 9 out of 31:

  • 9/31

Probability of getting a peanut butter cookie at second attempt is 8 out of 30 as one already taken and the total number has changed as well:

  • 8/30= 4/15

Probability of getting 2 peanut butter cookies is the product of each probability we got above:

  • 9/31×4/15= 12/155

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