# Thread: i want help in founding equation in my problem

1. Originally Posted by Plato
That is a completely standard notation used in counting problems.
It is the binomial coefficient.

$\dbinom{N}{k}=\dfrac{N!}{k!(N-k)!}$.
sorry but i don't know about them

2. at all thx
but i think when using this way the result will be 378 not 336 for example of 16 , 6

3. Originally Posted by mido22
sorry but i don't know about them
This is not a tutorial service.

Originally Posted by mido22
but i think when using this way the result will be 378 not 336 for example of 16 , 6
$\dbinom{11}{6}-\dbinom{9}{4}=336$

4. Originally Posted by Plato
This is not a tutorial service.
ok but i get a binomial calculator and i entered N : X - y +1 and K : y
and subtract from it :
N : x - y -1 and k : y and then the solution will be 378 not 336

5. ah yes thx very much plato u r right

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