Permutations & Combinations for large inputs

[Werner]

(05-26-2015 05:14 PM)Dieter Wrote:  Since the program calculates n!/(n–r)! first (which always is an integer) the results should be exact here.

Only for n<16 I'm afraid.
eg. PERM(16,5) = 16!/(11!) = 524160.0001. There's 110 cases like this for n<70.
All of them can be corrected with 0.1 + INT.
Worst case is PERM(64,5)=

Then there are a few cases with a result of 10 significa