Throwing a die more than 20 times to get 6 means that 20 times you do not get 6. The probability of not getting 6 once is "\\frac{5}{6}". The probability of not getting 6 during 20 times is "(\\frac{5}{6})^{20} = \\frac{95367431640625}{3656158440062976}" which is the answer.
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