Find the Probability that an Event Will Not Occur
-A bag contains 20 marbles, of which 3 are blue and 7 are green. One marble is drawn from the bag. What is the probability that the marble drawn is not blue?
A) $\frac { 17 } { 20 }$
B) $\frac { 3 } { 20 }$
C) $\frac { 3 } { 10 }$
D) $\frac { 1 } { 2 }$

Question

Quizplus · Accepted Answer

The probability that the marble drawn is not blue is 1 minus the probability of drawing a blue marble. There are 3 blue marbles out of 20, so the probability of not drawing a blue marble is $1 - \frac{3}{20} = \frac{17}{20}$.

Find the Probability That an Event Will Not Occur -A 1720\frac { 17 } { 20 }2017​

Find the Probability That an Event Will Not Occur
-A $\frac { 17 } { 20 }$