Obtaining the Poisson distribution in the calculator.

Question

I want to calculate a Poisson that involves the calculation of $100!$ Does anyone know how to program it in a Casio calculator?

Answer 1

Your calculator may overflow at $10^{100}$ while $100!\approx 9.3\times 10^{157}$.

If so, and assuming you want to use $100!$ in multiplication, one approach would be to use logarithms, as $\log(100!)=\log(1)+\log(2)+\cdots+\log(100)$.

I leave the programming to you, but as a check, $\log_{10}(100!)\approx 157.97$ and $\ln(100!)\approx 363.74$.