Mathematics Sets Set Theory and types of Sets

Let P, Q, R be proper subsets of universal set, then true statement is:

1
(P ∪ Q)' = P' ∪ Q'
2
(P ∪ Q)' = P' ∩ Q'
3
(P ∪ Q)∪R = P∩(Q ∪ R) 
4
P∪(Q ∩ R) = (P ∩ Q) ∪ (P ∩ R)
5
Not Attempted

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