Suppose you have three opaque boxes, like pictured below.
One box has skittles, one box has M&M's and one box has a mixture.
(There are nog S or M markings on the food.)

They are all labelled wrong.
In the worst circumstances, what is the maximum amount of skittles/M&M's
you have to check to see which box is which?

Skittles ^
M&M's ^
Mixture ^