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P={0,1,2,3,4,5}
Q={-2,-1,0,1,2}
R={-1,0,1,2,3,4,5,6}
P∩Q={0,1,2}
P∩R={0,1,2,3,4,5}
Q∩R={-1.0,1,2}
P∩Q∩R={0,1,2}
Gambar terlampir.
n(S)=36
n(S)=n(Matematika∪B.Indonesia)+n(Matematika)+n(B.Indonesia)+n(tidak keduanya)
⇔36=x+18-x+20-x+2
⇔36=40-x
⇔x=40-36
⇔x=4
n(Matematika)=18-4=14
n(B.Indonesia)=20-4=16
Gambar terlampir.
n(S)=50
n(S)=n(Koran∪Majalah)+n(Koran)+n(Majalah)+n(tidak keduanya)
⇔50=x+25-x+30-x+5
⇔50=60-x
⇔x=10
n(Koran)=25-10=15
n(Majalah)=30-10=20
Gambar terlampir.
Semangat!