Question

Thanks guys!

Answer 1

@mathslover if you have time?

Answer 2

I answered 160

Answer 3

How did you get 160?

Answer 4

I forgot how but I think I counted two for every possible out of 20 people. If that made sense?

Answer 5

actually I recounted it would be 40 right?

Answer 6

No need to count actually. I think, it is 380 but I am not sure.

Answer 7

@KingGeorge - Can you please confirm it?

I did like this :

\(\cfrac{20!}{(20-2)!} = \cfrac{20!}{18!} = 20 \times 19 = 380\)

Answer 8

Ok i'm writing it down. Thanks

Answer 9

Bison, am not sure yet. Wait for KG's response please.

Answer 10

k

Answer 11

@mathslover is correct.

An alternative way to look at it would be to say that you have 20 choices for the captain, and 19 for the co-captain, so there are \(20*19\) choices total.

Answer 12

Oh I feel better now :) Thanks @KingGeorge

Answer 13

awesome! Thanks guys!!

Answer 14

You're welcome :)

Answer 15

No problem.

Answer 16

I don't feel we do enough probability. So when it comes time to do the work I am not entirely clear on it all. Thankful for you guys here at Open Study!

Answer 17

@mathslover @KingGeorge