Question

A box contains two white balls, three black balls and four red balls. In how many ways can three balls be drawn from the box, if at least one black ball is to be included in the draw?

Answer 1

The box contains 2 white, 3 black and 4 red balls 

We have to draw 3 balls in which there should be alteast 1 black ball 

The possible draws are as follows 

Black balls = 3 

Red and White = 2 + 4 = 6