(19C/29C) (k-)Permutations, Combinations, Linear Regression and Pseudo-random number

[David Hayden]

In the factorial function, you could remove steps 7 and 8 (GSB 2, RTN) and just let control fall through to LBL 2.

Also, the combinations function looks like it will overflow for large N and small K. You can avoid this by alternately multiplying and dividing. For example, compute 10C3 by doing 8 * 9 / 2 * 10 / 3. This has the remarkable property that the divisions always result in an integer value!