Combinations and permutations: Difference between revisions

=={{header|R}}==

R has most of this built in. The documentation for choose warns that it only calculates its result directly if k is small. Skimming [https://github.com/wch/r-source/blob/trunk/src/nmath/choose.c what appears to be the source code] suggests that 29 is the highest "small" k. This means that we can solve both tasks with little more than R's choose.

print(perm(seq(from = 3, to = 12, by = 3), seq(from = 2, to = 8, by = 2)))

print(choose(seq(from = 10, to = 60, by = 10), seq(from = 3, to = 18, by = 3)))

#R does not have big integers by default and will return Inf without warning.

#R's documentation does not tell us exactly when choose's behaviour changes.

=={{header|Racket}}==