The bag contains 20 marbles. There are 5 green marbles, 9 red marbles, and 6 blue marbles. What is the probability of randomly selecting a marble that is NOT red? Simplify your fraction if possible.
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P(not red) = 9/20
P(not red) = 3/10
P(not red) = 11/20
To find the probability of randomly selecting a marble that is NOT red, we need to find the number of marbles that are not red and divide it by the total number of marbles.
In this case, there are 5 green marbles and 6 blue marbles, which means there are a total of 11 marbles that are not red. The total number of marbles is 20.
So, the probability of randomly selecting a marble that is not red is 11/20.
Simplifying the fraction, we can divide both the numerator and the denominator by their greatest common divisor, which is 1 in this case. Therefore, the fraction cannot be simplified any further, so the simplified form is 11/20.