$$P_3^3 = 3! = 6$$
| Permutation ±Æ§Ç | $$P_r^n$$ | & Combination ²Õ¦X | $$C_r^n$$ |
|---|
| Permutation Pnr | Combination Cnr | ||
|---|---|---|---|
| $$C_3^3 = 1$$
$$P_3^3 = 3! = 6$$ |
$$P_3^3 = 3! = 6$$ |
||
| $$P_r^n = \frac{n!}{(n-r)!}$$ = | $$C_r^n = \frac{n!}{r! (n-r)!}$$ = |
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