Hey, I know this is random, but can somebody explain how to use nCr in Calculus? I'm taking an IB test soon, and I kinda forgot how to use it.
Thanks!
Thanks!
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Suppose that you have n objects, and you want to choose r of them.
The number of possible ways in which you can do so is nCr.
The difference between nCr and nPr is the order.
When we talk about nCr, we do not care which object you choose first, which you choose second... so on and so for. But with nPr, we consider the different combinations where you can pick up the objects, as well as the order in which you pick them up.
nCr = n! / [r! (n - r)!]
nPr = n! / (n - r)!
The number of possible ways in which you can do so is nCr.
The difference between nCr and nPr is the order.
When we talk about nCr, we do not care which object you choose first, which you choose second... so on and so for. But with nPr, we consider the different combinations where you can pick up the objects, as well as the order in which you pick them up.
nCr = n! / [r! (n - r)!]
nPr = n! / (n - r)!