So I'm trying to understand this notation and it's meanings:
(x)
(2)
But pretend the two parenthesis on each side are put together so it's "x choose 2".
I really have no idea how to use this!
(x)
(2)
But pretend the two parenthesis on each side are put together so it's "x choose 2".
I really have no idea how to use this!
-
It's the combinations of X things two at a time.
In general, Combinations is nCr, or C(n,r), which is the combinations of n things, r at a time.
The general formula is:
C(n,r) = n! / ( r! (n-r)! )
So, x things two at a time would be:
C(x,2) = x! / ( 2! (x-2)! )
Naturally, you need to know the numeric value of x before you can calculate the exact number of combinations.
In general, Combinations is nCr, or C(n,r), which is the combinations of n things, r at a time.
The general formula is:
C(n,r) = n! / ( r! (n-r)! )
So, x things two at a time would be:
C(x,2) = x! / ( 2! (x-2)! )
Naturally, you need to know the numeric value of x before you can calculate the exact number of combinations.