一颗骰子投两次, 记第一次得到的数值为, 第二次得到的数值为, 将它

一颗骰子投两次, 记第一次得到的数值为, 第二次得到的数值为, 将它们作为关于的二元一次方程组的系数, 则方程组有唯一解的概率为              。(用数字作答)

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