A certain company sells jellybeans in the following six flavors only: banana, chocolate, grape, lemon, peach and strawberry. If the jellybeans are sorted randomly into boxes containing exactly 2, 3 or 4 different flavors only, what is the probability that any given box contains grape jellybeans?

a) 1/6

b) 1/3

c) 2/5

d) 1/2

e) 3/4

Also, is there an example of such a problem in Combinatorics & Probability XII Veritas Prep Guide.

Thanks in advance.