Combinatorics

What is a Factorial?

Product of numbers from 1 to n

  • High school
  • about 3 min
  • 1 of 11 in the family
Not started

Factorial breakdown

5!=5×4×3×2×1=120
5!=5×4×3×2×1=1205! = 5 \times 4 \times 3 \times 2 \times 1 = 120

1!

1

2!

2

3!

6

4!

24

5!

120

5! = product of all natural numbers from 1 to 5. Special case: 0! = 1.

Where it is taught