A box contains 20 green balls, 15 red balls and 25 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.
A) 6/7	B) 5/11	C) 3/8	D) 1/13	E) 7/12
Total number of balls = 20+15+25= 
<gadget id="calculator">20+15+25</gadget>
<output>60</output>
60   n(s)=60   7/121 = event of drawing a red ball = 15/60 = 1/4   7/122 = event of drawing a green ball = 20/60 = 1/3   P(7/121)+P(7/122) = (1/4)+(1/3) = 7/12   Answer is 7/12
<result>E</result>
A box contains 20 green balls, 15 red balls and 25 white balls. A ball is drawn at random from the box. What is the probability that the ball drawn is either red or green?