A ball is drawn randomly from a jar that contains 7 red balls, 4 white balls, and 9 yellow balls. Find the probability of the given event. Write your answers as reduced fractions or whole numbers.

(a) P\displaystyle {P}(A red ball is drawn) =  

(b) P\displaystyle {P}(The ball drawn is NOT red) =  

(c) P\displaystyle {P}(A green ball is drawn) =