In the following situation, determine whether you are asked to determine the number of permutations or combination Then do the calculation. How many ways can the four offices of chairman, vice chairman, secretary, and treasurer be filled from a club with 28 members?
a. Permutation; 28P4=491,400
b. Permutation; 24P4=255,024
c. Combination; 28C4=20475
d. Combination; 24C4=10626