A bag contains 5 black balls 4 white balls and 3 red balls. If a ball is selected at random the probability that it is a black or a red ball is

A bag contains 5 black, 4 white, and 3 red balls ⇒n(S)= 12C1=12 E =  Select a black or a redn(E)= 5C1+3C1=8 P(E)=812 =23 The probability that it is a black or a red ball is  23