3C×4C16P3\frac{{ }^{3} \mathrm{C\times}^{4} \mathrm{C}_{1}}{{ }^{6} \mathrm{P}_{3}}6P33C×4C1
2P2×4P26C3\frac{{ }^{2} P_{2} \times^{4} P_{2}}{{ }^{6} C_{3}}6C32P2×4P2
2C2x4C16C3\frac{{ }^{2} \mathrm{C}_{2} \mathrm{x}^{4} \mathrm{C}_{1}}{{ }^{6} \mathrm{C}_{3}}6C32C2x4C1
None of these \text { None of these } None of these