In a lottery, there are 10 prizes and 30 blanks. A lottery is drawn at random. What is the probability of getting a prize?	Choose the correct choice from the following answers.
A) 1/10	B) 2/5	C) 2/7	D) 1/4	E) None
Solution   P(getting a prize)	= 10 / (10+30)   ‹=› 10 / 40   ‹=› 1 / 4.   Answer 1/4
<result>D</result>
In a lottery, there are 10 prizes and 30 blanks. A lottery is drawn at random. What is the probability of getting a prize?