A bag contains 7 red, 5 blue and 4 green balls. If 2 ballsare picked at random, what is the probability that both are red?
Choose the most appropriate option
A) 2/15 B) 2/21 C) 7/40 D) 3/29 E) 4/27
P(Both are red),   =77/402167/402=77/402167/402   =21/120= 7/40   7/40
<result>C</result>
A bag contains 7 red, 5 blue and 4 green balls. If 2 ballsare picked at random, what is the probability that both are red?