Practice Problems for  the Lander Math Contest
Module 9, Problems (26-28)

26) How many ways can 4 people be chosen from a group of
9 people?

27) How many 5 letter “words” can be arranged from the first
7 letters of the alphabet? [Note: “words” can use each letter at
most once.]

28) Fill in the blank: The number of permutations nPk is
______ times larger than the number of combinations
nCk.