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Mathematics 20 Online
OpenStudy (anonymous):

I’m buying a new car. It comes in eight different colors and two different styles. How many total options do I have?

OpenStudy (anonymous):

So you are basiclly adding?

OpenStudy (anonymous):

8+2=10

OpenStudy (anonymous):

this is permutations and combinations

OpenStudy (anonymous):

oooh

OpenStudy (anonymous):

okay give me a sec

OpenStudy (anonymous):

choices are A. 20 B. 22 C. 28 D. 16

OpenStudy (anonymous):

please show your work

OpenStudy (anonymous):

I think it's c

OpenStudy (anonymous):

why?

OpenStudy (anonymous):

Ok

OpenStudy (anonymous):

So basiclly

OpenStudy (anonymous):

We are sorting (n) and (r)

OpenStudy (anonymous):

So (r) goes first and (n) goes second

OpenStudy (anonymous):

So in this case (r)=2

OpenStudy (anonymous):

and (n)=8

OpenStudy (anonymous):

Got it?

OpenStudy (anonymous):

:D

OpenStudy (anonymous):

So the answer in 28

OpenStudy (anonymous):

ok thank you

OpenStudy (anonymous):

Oh wait

OpenStudy (anonymous):

I'm so dumb

OpenStudy (anonymous):

what

OpenStudy (anonymous):

Oh

OpenStudy (anonymous):

I explained to you totally wrong

OpenStudy (anonymous):

Okay sorry

OpenStudy (anonymous):

You there?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

Ok so here is the formula

OpenStudy (anonymous):

nCr = nPr / r!

OpenStudy (anonymous):

So first

OpenStudy (anonymous):

i really dont know ;-;

OpenStudy (anonymous):

im trying to undeestand it

OpenStudy (anonymous):

Sorry

OpenStudy (anonymous):

yaeh this one is confusing

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