please ya kak dibantu

kalo ada yg gak jelas komen aja yaa

[tex] p = \binom{4 \: \: 2}{1 \: \: 1} \\ p { }^{ - 1} = \frac{1}{2} \binom{1 \: \: - 2}{ - 1 \: \: 4} \\ = \binom{ \frac{1}{2} \: \: - 1 }{ - \frac{1}{2} \: \: \: \: 2} [/tex]
semoga membantu........