15c2/7c6

- anonymous

15c2/7c6

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- anonymous

Do you have instructions for this problem?

- anonymous

Its use the formula nCr to evlauate the expression

- anonymous

On your graphing calculator?

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## More answers

- anonymous

yeah

- anonymous

what would it come out to

- anonymous

15

- anonymous

no

- anonymous

What do you mean? Did I mess up?

- anonymous

its not 15

- anonymous

Hang on...

- anonymous

15c2=105 and 7c6=7 right?

- anonymous

yes

- anonymous

So, 105/7=15 right? Or maybe I misread your equation...

- anonymous

What did you get?

- anonymous

\[\frac{\frac{15!}{2!13!}}{\frac{7!}{6! }}=15 \]
The cobination of 15 things taken 2 at a time divided by 7 things taken 6 at a time?

- anonymous

That's what I thought too

- anonymous

I typed in 15 and it said wrong

- anonymous

I posted as soon as something worked out and did not realize that you had posted. Sorry.

- anonymous

so

- anonymous

No problem robtobey. Hang on prettychicka45, I'm thinking...

- anonymous

So your problem looks exactly like this: \[15c2/7c6\]

- anonymous

Meaning 15c2 divided by 7c6 right?

- anonymous

yes

- anonymous

O.K...

- anonymous

i

- anonymous

Still not seeing why 15 is wrong... Thinking...

- anonymous

Anything else in your instructions? Any other hints?

- anonymous

it says to type as a fraction

- anonymous

Try typing 15/1

- anonymous

it was 65

- anonymous

OK, that's not quite making sense...

- anonymous

That's not even a fraction

- anonymous

Sorry

- anonymous

Any thoughts anyone?

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