in formula command the factorial ! calculation not done .
is there is function to get factorial values and combination values
We do not have builtin functions for calculating factorial nor for combination values. But you can write your own functions for that. I prepared a small example:
Example:
F(4) = {=factorial(4)}
C(4, 2) = {=combination(4, 2)}
{factorial=(n)>reduce(seq(1,n), 1, (a, v)>a*v)}
{combination=(n, r)>factorial(n)/factorial(r)/factorial(nr)}
Here how it works:
 Lambda functions are used to create custom functions. You can read more about them here.

seq(1,n)
 this is builtin function that creates an ordered list from 1 ton
. 
reduce
 this is also builtin function that aggregates the elements of the list. It starts with1
which is the second parameter, uses list that was generated byseq
function and applies aggregation function which is a third parameter. In general it just multiplies all the elements ofseq
.
You can find all the available builtin functions here.
3 Likes
Small update, the factorial function was not working for 0
. Here an updated formula to fix that bug:
{factorial=(n)>reduce(seq(1,n), 1, (a, v)>a*v) if n > 0 else 1}