Six students are contesting the election for the presidentship of the students, union. In how many ways can their names be listed on the ballot papers?

Question

Philoid · Accepted Answer

To find: number of arrangements of names on a ballot paper.

There are six contestants contesting in the elections.

Name of any 1 student out of six can appear first on the ballot paper.

2 position on the ballot paper can be filled by rest of the five names and so on.

Formula:

Number of permutations of n distinct objects among r different places, where repetition is not allowed, is

P(n,r) = n!/(n-r)!

Therefore, permutation of 6 different objects in 6 places is

P(6,6) =

= = = 720.

Hence, their name can be arranged in 720 ways.