think about it..

                     first to answer this question.it is impossible with limited the criteria listed
                     because somebody could use infinate types of weed in just one joint.
                     but, as logic goes, with three types of flavor's to three joint's this
                     answer would logically be three, with every preceding answer in the
                     course of logic being the next number UP 4, 5, 6, 7, ect...because
                     logic is flawed, and logic in this case would state it's chances on the
                     top side of this equasion not looking to the inverse, or halfing of a
                     number [halfing would be, in this case, the mixing of the two types of-
                     -weed][the blue yellow green thing again].....