Question

Robert has three boxes of letters: The first box contains the six letters in the word "bubble" the second box has the three letters in the word "zoo" and the third contains the four letters in the word "taxi". If he randomly selects one letter from each of the three boxes, what is the probability that the three letters spell the word "box"?

Answer 1

3/6 * 2/3 * 1/4

since no letters occurs in more than one box, things are simple.