14!/19*18*17*16*15
As posted,
14!/19*18*17*16*15=6402373705728000/19
but I think you mean
14!/(19*18*17*16*15) which equals
20180160/323
In any case, please check your problem for typo and parentheses.
If you are posting a fraction, parentheses must be inserted BY YOU around the numerator and denominator.