Factorials and Permutations

5! = ?

• 5 x 4 x 3 x 2 x 1 = 120

• 5 x 4 x 3 x 2 x 1 = 60

• 5 + 4 + 3 + 2 + 1 = 15

• 5 + 4 + 3 + 2 + 1 = 5

9! = ?

• 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 362880

• 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 45

• 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 60480

• 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 10

2! = ?

• 2 x 1 = 3

• 2 + 1 = 3

• 2 x 1 = 2

• 2 + 1 = 4

4! = ?

• 4 + 3 + 2 + 1 = 11

• 4 x 3 x 2 x 1 = 24

• 4 + 3 + 2 + 1 = 8

• 4 x 3 x 2 x 1 = 12

7! = ?

• 7 x 6 x 5 x 4 x 3 x 2 x 1 = 2520

• 7 + 6 + 5 + 4 + 3 + 2 + 1 = 22

• 7 + 6 + 5 + 4 + 3 + 2 + 1 = 28

• 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5040

₁₀ P _{2 = ?}

• 90

• 45

• 12

• 20

₂₅ P ₄ = ?

• 12650

• 100

• 303600

• 29

₁₂ P ₆ = ?

• 665280

• 72

• 18

• 924

₇ P ₃ = ?

• 21

• 210

• 35

• 10

₅ P ₂ = ?

• 10

• 7

• 5

• 20