1.

Suppose A1,A2,.....A30 are thirty sets each having 5 elements and B1,B2,.....Bn are n sets each with 3 elements , let ⋃30r=1 = ⋃nf=1Bj=S and each of S belongs to exactly 10 of the A′si and exactly 9 of the B′si, 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 30r=1 = nf=1Bj=S and each of S belongs to exactly 10 of the Asi and exactly 9 of the Bsi, then n is equal to




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