CUSAT 2022 BTech Solved Paper Shift 3

Question : 182 of 200

Marks: +1, -0

Suppose A1,A2,...,A30 are thirty sets, each with five elements and B1,B2,...,B30 are n sets each with three elements. Let ⋃i=130Ai=⋃j=1nBj=S. If each element of S belongs to exactly ten of the Ai 's and exactly nine of the Bj 's then n=