Visualize P formula and C formula

n:

3

ABC

r:

1

Permutation

Permutation is arrangement of a set things when the order in which they appear is important.

Taken 'r' things out of 'n' things at a time, it equals n! / (n - r)! which, in this case, is 3

All permutations are: A, B, C

Combination

Combination is a set things where the order in which they appear is not important.

Taken 'r' things out of 'n' things at a time, it equals n! / (r! * (n - r)!) which, in this case, is 3

All combinations are: A, B, C

Tags: Mathematical Foundations for Data Science,