question_answer

A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected randomly, then the probability that it is a black or red ball is:             

A)  \[\frac{1}{3}\]                         

B)  \[\frac{1}{4}\]

C)  \[\frac{5}{12}\]                        

D)  \[\frac{2}{3}\] 

E)  None of these