This combo set includes 6 worksheets for less than the cost of buying them individually! Includes: Counting Problems I,IIIa, IIIb, IV (word problems on permutations and combinations. Two of the worksheets have smaller numbers for calculating by hand), II (counting problem with smaller numbers, includes "license plate" type problems and n*m problems.), and V (counting principles, based on a store where you can build a stuffed frog toy. Includes n*m problems, tree diagrams, permutations, and combinations).