Find the Indicated Probability $\frac { 4 } { 13 }$

Multiple Choice

Find the indicated probability.
-A bag contains 8 red marbles, 4 blue marbles, and 1 green marble. Find P(not blue) .

A) 9

B) $\frac { 4 } { 13 }$

C) $\frac { 13 } { 9 }$

D) $\frac { 9 } { 13 }$