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Love Mint Forever
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$p(i,j)=\frac{j-1}{k-1}p(i-1,j)+\frac{k-j+1}{k-1}p(i-1,j-1),p(1,1)=1$
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Face the fear,make the future.
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《象》曰：泽灭木，大过。君子以独立不惧，遁世无闷。
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