ISEE Word Problems Question 226: Answer and Explanation
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Question: 226
6. A cookie jar contains 4 chocolate chip cookies, 10 sugar cookies, and 13 oatmeal raisin cookies. If one cookie is chosen at random, and a second cookie is chosen at random, what is the probability that both cookies will be chocolate chip?
- A.
- B.
- C.
- D.
Correct Answer: B
Explanation:
The answer is B
Probability is always a fraction, 
. In the first reach into the cookie jar, we want a chocolate chip (4) out of all the cookies (27). Therefore, the first reach is . For the second reach, there is one less chocolate chip cookie and one less cookie total, so the probability of again getting a chocolate chip cookie is 
. When you need two probabilities to occur, you multiply the fractions.