Dividing factorials on 15C CE

[Johnh]

I get the same results on my 15C CE.

For a basically 40-year-old design, 15C's have plenty of calculation digits for any normal calculation, then or now. But these interesting cases are pushing the limits of the accuracy to which the final result can be delivered. We only notice this because we know that the true result of dividing two such factorials has to be a whole number, eg 50! / 45! = 46 x 47 x 48 x 49 x 50 = 254,251,200

I tried 50! / 45! with TouchRPN on my Samsung S22 using the HP15C mode and it did indeed deliver 254,251,200.0. But I'm assuming that although this App is generally a great emulation of the real thing it's not an exact digit for digit copy and it uses greater internal accuracy.