All ISEE Lower Level Math Resources
Example Questions
Example Question #91 : Probability
A bag has red marbles,
green marbles, and
blue marbles. What is the probability of NOT drawing a red marble on the first draw?
Possible Answers:
Correct answer:
Explanation:
Recall that a probability is the likelihood of something occurring.
Mathematically, we can write probability as the following:
For this question, we do not want a red marble. This means that we are trying to find the probability of drawing either a blue or a green marble. Since we have blue marbles and
green marbles, we have
wanted outcomes. Since there is a total of
marbles, we have a total of
possible outcomes.
The probability then becomes the following:
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