An election ballot asks voters to select two city commissioners from a group of four candidates. In how many ways can this be done?

Let n = 12

Let r = 6

Replace every n! with 12 and every r! with 6 and then do the math.

nCr = 12!/[ (12 - 6) !*6!]

nCr = 479001600 / (720) (720)

nCr = 479001600/518400

nCr = 924

There are 924 ways or combinations to select 6 city commissioners from a group of 12 candidates

924 ways to do this : D:D