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Let A1,A2,A3. . . . .,A40, are 40 sets each with 7 elements and B1,B2,. . . ..Bn are n sets each with 7 elements. If ⋃40i=1Ai=⋃nj=1Bj=S and each element of S belongs to exactly ten of Ai's and exactly 9 of Bj's, then n equals

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Let A1,A2,A3. . . . .,A40, are 40 sets each with 7 elements and B1,B2,. . . ..Bn are n sets each with 7 elements. If 40i=1Ai=nj=1Bj=S and each element of S belongs to exactly ten of Ai's and exactly 9 of Bj's, then n equals




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