Mark the correct alternative in each of the following: If one ball is drawn at random from each of three boxes containing 3 white and 1 black, 2 white and 2 black, 1 white and 3 black balls, then the probability that 2 white and 1 black balls will be drawn is

Mark the correct alternative in each of the following:
If one ball is drawn at random from each of three boxes containing 3 white and 1 black, 2 white and 2 black, 1 white and 3 black balls, then the probability that 2 white and 1 black balls will be drawn is

There are 3 ways of drawing 2 white balls and 1 black ball from the three boxes, i.e.,

WWB,WBW,BWW

For box 1,

For box 2,

For box 3,

1