<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />

# Permutations and Combinations Compared

## Order is important when picking r at a time from a group of n:  nPr = n!/ (n-r)!

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Permutations and Combinations Compared

This Concept introduces students to the basics of permutations and combinations.
MEMORY METER
This indicates how strong in your memory this concept is
0
• Video

## Difference Between Permutations and Combinations - Part 1

Learn how to distinguish between combinations and permutations with this helpful cat example.
MEMORY METER
This indicates how strong in your memory this concept is
1
• Video