a relay race has a team of 4 runners who run differnet parts of the race. there are 20 students on your track squad. in how many ways can the coach select students to compete on the relay team?

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- anonymous

if youre going to type down an answer....then yeah

- anonymous

This looks like a straight forward permutation.20P4 ways i.e 160000 ways

- anonymous

sorry it is 116280

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- anonymous

if its permutation it would be 116280 but if its combination it would be 4845
im not sure whether its permutation or combo

- anonymous

it is a permutation since order does matter

- anonymous

I calculated wrongly.20P4 = 116280 ways

- anonymous

oh
is it because it says "diff. parts of the race"

- anonymous

Let us take one person .This same person can run in any part of the race (i.e first,second, third or fourth).So every order is important

- anonymous

right, thanks!!!!!!!!!!!!!!

- anonymous

by the way, I posted the answer to your other question on permutations i.e the one about selecting the editor in chief

- anonymous

It is merely 20 * 19 * 18 * 17 = 116280

- anonymous

thanks damdam

- anonymous

thanks blexting

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