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Let n in N, Sn=sum(r=0)^(3n)^(3n)Cr and ...

Let `n in N, S_n=sum_(r=0)^(3n)^(3n)C_r` and `T_n=sum_(r=0)^n^(3n)C_(3r)`, then `|S_n-3T_n|` equals

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