P and Q are two non-empty sets. Given: 2 n(P) = 12, n(Q) = 6 and n (P U Q) = 10. Then n (P ∩ Q) is

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P and Q are two non-empty sets. Given: 2 n(P) = 12, n(Q) = 6 and n (P U Q) = 10. Then n (P ∩ Q) is