[m]A^{10}_{14}=\frac{14!}{(14-10)!}=\frac{14!}{4!}[/m]
[m]\frac{P_{14}}{A^{10}_{14}}=\frac{14!}{\frac{14!}{4!}}=4!=1*2*3*4=24[/m]
[m]C^{5}_{6}=\frac{6!}{5!\cdot (6-5)!}=6[/m]
[m]C^{11}_{11}=\frac{11!}{11!\cdot (11-11)!}=1[/m]
[b]0!=1[/b]
[m]\frac{P_{14}}{A^{10}_{14}} : C^{5}_{6}: C^{11}_{11}=24:6:1=4[/m]