jika n(p) = 21, n(q) = 30. carilah nilai n(P gabungan Q) jika n(P arsiran Q) = 10?

[tex]n(P)=21 \\ n(Q)=30 \\ n(P\cap Q)=10 \\ $Ada rumus:$ \\ n(P\cup Q) = n(P)+n(Q)-n(P\cap Q) \\ n(P\cup Q) = 21+30-10 \\ n(P\cup Q)=41[/tex]