Find the Indicated Probability $\frac { 3 } { 10 }$

Multiple Choice

Find the indicated probability.
-A bag contains 6 red marbles, 3 blue marbles, and 1 green marble. Find P(not blue) .

A) 7
B) $\frac { 3 } { 10 }$
C) $\frac { 10 } { 7 }$
D) $\frac { 7 } { 10 }$