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[" (c) "A uu B=R^(2)],[" Suppose "A(1),A...

[" (c) "A uu B=R^(2)],[" Suppose "A_(1),A_(2),...,A_(30)" are thirty sets each with five ele- "],[" ments and "B_(1),B_(2),...,B_(n)" are "n" sets each with three elements "],[" such that "uuu A_(i)=uuu B_(i)=S." If each element of "S" belongs to "],[" exactly ten of the "A_(i)^( prime)" 's and exactly "9" of the "B_(j)^( prime)" ,then the "],[" value of "n" is "]

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