ProbabilityDiscrete Mathematics Level 3
There are 3 similar boxes, each has 2 similar drawers. The drawers of the 1st box have 1 pencil each, the drawers of the 2nd box have 1 pen each and each of the drawer of the last box has 1 pen and 1 pencil. A box is selected by lottery and a pencil is found from a drawer of the selected box. What is the probability that the pencil was from the 1st box?