A box contains 5 green balls, 4 red balls and 6 white balls. A ball is drawn at random from the box. What is the probability that the ball drawn is either red or green?
Choose the correct choice from the following options:
A) 2/3 B) 1/4 C) 3/5 D) 1/2 E) 2/5
Total number of balls = 4+5+6= 
<gadget id="calculator">4+5+6</gadget>
<output>15</output>
15   n(s)=15   E1 = event of drawing a red ball = 4/15   E2 = event of drawing a green ball = 5/15   P(E1)+P(E2) = (4/15)+(5/15) = 9/15 = 3/5   Answer is 3/5
<result>C</result>
A box contains 5 green balls, 4 red balls and 6 white balls. A ball is drawn at random from the box. What is the probability that the ball drawn is either red or green?