If 2 pens are drawn at random from the pack, NOT replaced and then another pen is drawn. We have to find the probability of drawing 2 blue pens and 1 black pen. We have a total of 4 + 2 + 3 = 9 pens out of which 4 are blue, 2 are red and 3 are black pens.
Explanation:
Sana makatulong.