Question

In how many ways can a chairperson and a vice chairperson be selected from a committee of 20 senators?
ways

Answer 1

From 20 senators (n=20), we select two (x=2) at a time.

Evaluate the 'combinations' function\[_{n}C _{x}=_{20}C _{2}\]

Answer 2

20 choose 1 for the chairperson
19 choose 1 for the vice
(20 x 19 ) /2 since can be switched

Answer 3

Tricia: Please clarify what you mean by "/2 since can be switched." Thank you.

Answer 4

I have forgotten a lot of this but the person for chair could be picked for the vice