Suppose A_1,A_2,A_3 ..... A_{30} are thirty sets each having 5 elements and B_1,B_2,B_3, ..... B_n are nsets each with 3 elements, let \cup^{30}_{i=1}A_i = \cup^{n}_{i=1}B_j = S and each element of S belongs to exactly 10 of the A_i's and exactly 9 of the B_j's. Then n is equal to

JEE Mains Model Paper 4

Question : 29 of 90

Marks: +1, -0

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

∪

i=1

Ai =

∪

i=1

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

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