Suppose A_1,A_2,….,A_30 are thirty sets eachhaving 5 elements with no common element across the

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Suppose A_1,A_2,….,A_30 are thirty sets each
having 5 elements with no common element across the sets and B_1,B_2,…..,B_n are n sets each having 3 elements with no common element across the sets. Let ⋃_(i=1)^30▒〖A_i=⋃_(j=1)^n▒〖B_j=S〗〗 and each element of S belong to exactly 10 of A_j's and exactly 9 of B_j's. The value of n is equal to
(a) 15
(b) 30
(c) 40
(d) 45
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If A1, A2, ..., A30 me common element nahi hai to S ke each element exactly 10 of Ai kaise belongs karega .... Very wrong concept u applied

Gaurav_kumar_mgk
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2 hours spent on it, question rat gaya par concept abhi tak samaj nahi aya.

shashankvashishtha
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Ans is 45(yad ho rkha h) lekin concept dekna padega ek bar

viditvats
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Last line samanj nhi aaye please anyone explain

anujsaini