Counting Principles and Permutations

Front

Fundamental Principle of Counting

Back

if one task can be done in m ways and another in n ways, then both can be done in m × n ways.

Front

FACTORIAL

Use factorial when you're finding how many ways things can be arranged or selected.

Back

n!=n×(n-1)×(n-2)×....2×1

4! = 4×3×2×1=24

Front

Permutations

Arrangements of objects

Back