Question

In a box there are 20 red ink pens 50 blue ink pens and 30 black ink pens. One pen is taking at random from the box. a) What is the probability of getting a black ink pen? b) What is the probability of getting a black ink or blue ink pen? c) What is the probability of not getting a red ink pen?

Answer 1

Answer:

p(black) = 30/100 =0.3

p(black or blue) = 0.3 + 50/100 = 0.8

p(not Red) = 1- p(red) =1-0.2=0.8