Class 11| Chapter 1| Set | Important Question bases on Union|

Suppose A1​,A2​,.....,A30​ are thirty sets each with five elements and B1​,B2​,.....,Bn​ are n sets each with three elements such that ⋃i=130​Ai​=⋃j=1n​Bj​=S and each element of S belongs to exactly 10 of the Ai​'s and exactly 9 of the Bj​'s. Then n=

[DrMaujam]

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