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Suppose A1,A2,.....................A30 are thirty sets each having 5 elements and B1,B2,................Bn are n sets each with 3 elements, let 30⋃i=1Ai=n⋃j=1Bj = S and each element of S belongs to exactly 10 of Ai'S and exactly 9 of the Bj'S. Then n is equal to

Answer»

Suppose A1,A2,.....................A30 are thirty sets each having 5 elements and B1,B2,................Bn are n sets each with 3 elements, let 30i=1Ai=nj=1Bj = S and each element of S belongs to exactly 10 of Ai'S and exactly 9 of the Bj'S. Then n is equal to




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