I need to graph this function:
f(x) = (((39001!)/((39001-x)!*x!))*(999!/((999-x)!*x!)))/(40000!/((40000-20000)!*20000!))
in the interval from 19001 to 20000.
What program could do that? Can you also provide me a value table?
The easiest way to deal with very large calculations such as yours is to use a "Math Package", such as Mathematica, Maple.....etc. They also have very extensive graphing capabilities. In the meantime, if you wish to do large calculations such as these, go online and download a free calculator called "HiPER CALC". Just google it and you will see it.
For graphing only, you can try this online calculator: "The Desmos graphing calculator" Again just google it and will you see it.