How do you calculate for combinations formula on a scientific computer?

Question

chaise · Answer

$$n! / (r!(n-r)!)$$

Is this what you're asking?
Where n = total number of options
Where r = how many you're picking

anonymous · Answer

I understand that, but how would you plug in that formula to find the answer using a calculator?

anonymous · Answer

you hamy have nCr function

chaise · Answer

You have a factorial button on your calculator - look for it. Otherwise my calculate has a nPr and an nCr function.

anonymous · Answer

chaise the formual you posted is for permutaion not for cobination , isn't it?

anonymous · Answer

You need to have some calculator with Combinations function or you might have to create one...

anonymous · Answer

once you click on that factorial button, what do you do afterwards to plug in the numbers?

anonymous · Answer

@rdhss, can you post a numbric example

anonymous · Answer

all the calculators now got these functions , nCr , nPr , check your calc.