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JEE Mains Model Paper 4

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Question : 29

Total: 90

Suppose A1,A2,A3 ..... A30 are thirty sets each having 5 elements and B1,B2,B3, ..... Bn are nsets each with 3 elements, let

Bj = S and each element of S belongs to exactly 10 of the Ai's and exactly 9 of the Bj's. Then n is equal to

15
3
45
35

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