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     EduGorilla 
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    Suppose P1, P2 … P30 are thirty sets each having 5 elements and Q1, Q2 … Qn are n sets with 3 elements each. Let  and each element of S belongs to exactly 10 of the Pi `s and exactly 9 of the Qj `s. Then, n is equal to

    Options :-

    1. 15
    2. 3
    3. 45
    4. None of these
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Reply To: Suppose P1, P2 … P30 are thirty sets each having 5 elements and Q1, Q2 … Qn are n sets….
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