1.出現1的機率\(\begin{align}\frac{1}{6}\end{align}\),出現3的機率\(\begin{align}\frac{1}{6}\end{align}\),不是1或3的機率\(\begin{align}\frac{4}{6}\end{align}\),所以
\(\begin{align}\frac{6!}{2!2!2!}\times(\frac{1}{6})^2(\frac{1}{6})^2(\frac{4}{6})^2\end{align}\)
2.代表共出現4種點數,例如aabbcd,所以先取2個數當aa及bb
再取兩個數當c及d,所以
\(\begin{align}C^6_2C^4_2\times\frac{6!}{2!2!}\times(\frac{1}{6})^2(\frac{1}{6})^2(\frac{1}{6})(\frac{1}{6})\end{align}\)
[ 本帖最後由 deca0206 於 2019-5-16 07:55 編輯 ]