Permutation ±Æ§Ç
$$P_r^n$$
&
Combination ²Õ¦X
$$C_r^n$$
n=
r=
Symbols
(n<=10)
Permutation P
n
r
Combination C
n
r
$$C_3^3 = 1$$
$$P_3^3 = 3! = 6$$
$$P_3^3 = 3! = 6$$
$$P_r^n = \frac{n!}{(n-r)!}$$ =
$$C_r^n = \frac{n!}{r! (n-r)!}$$ =
statCrunch(dice)
statCrunch(coin)
C
n
r
P
n
r
coin
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