Number of Permutations/Examples/4 from 52
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Example of Number of Permutations
The number of ways of choosing $4$ objects in order from a set of $52$ (for example, cards from a deck) is:
- ${}^{52} P_4 = 52 \times 51 \times 50 \times 49 = \dfrac {52!} {48!} = 6 \, 497 \, 400$
Proof
From Number of Permutations:
- ${}^{52} P_4 = \dfrac {52!} {\paren {52 - 4}!}$
$\blacksquare$
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $24$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $24$