A bag contains 4red, 5blue and 3green balls. If 3 ballsare picked at random, what is the probability that both are red?	Options.
A) 1 / 33  B) 1 / 22  C) 1 / 12  D) 1 / 44  E) 1 / 55

Rationale: "p ( both are red ) , = 4 c 3 / 12 c 3 = 1 / 55 e"
Answer: E