A.\(C_n^k = \dfrac{{n!}}{{\left( {n - k} \right)!\left( {k + 1} \right)!}}\)
B.\(C_n^k = \dfrac{{n!}}{{\left( {n - k} \right)!}}\)
C.\(A_n^k = \dfrac{{n!}}{{\left( {n - k} \right)!k!}}\)
D.\(A_n^k = \dfrac{{n!}}{{\left( {n - k} \right)!}}\)
Loga
Hóa Học lớp 12
