Misal :
S =
{1,4,7,10,13,16,19,22,25,28}
P = {4,10,16,22,28} =>
P` = {1,7,13,19,25}
Q = {1,4,7,25,28} => Q` = {10,13,16,19,25}
R = {1,10,22,25,28}
Pembuktian :
(P ∪ Q) = {1,4,7,10,16,22,25,28}
(P` ∩ R) =
{1,25}
(P` ∩ R)` = {4,7,10,13,16,19,22,28}
(P ∪
Q) ∩ (P` ∩ R)`
= {1,4,7,10,16,22,25,28} ∩ {4,7,10,13,16,19,22,28}
= {4,7,10,16,22,28}
P = {4,10,16,22,28}
(Q` ∪
R) = {1,10,13,16,19,22,25,28}
(Q` ∪
R)` = {4,7}
P ∪
(Q` ∪
R)`
= {4,10,16,22,28} ∪
{4,7}
= {4,7,10,16,22,28}
Kesimpulan :
Jadi, benar bahwa (P ∪
Q) ∩ (P` ∩ R)` = P ∪ (Q` ∪
R)`.
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