U = { x ; 0<x ; < 25 }

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A= { x ; x = bilangan prima < 20 }
B = { x ; x = bilangan ganjil < 20 }
C = { x ; x = bilangan cacah < 15 }
cari :
1. A gabungan C
2. A irisan B irisan C

U = { x ; 0<x ; < 25 }

A = {2, 3 , 5 , 7 , 11, 13, 17 , 19}
B = {1, 3 , 5 , 7, 9, 11, 13, 15, 17, 19}
C = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14}
1. A gabungan C = { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,17,19}
2. A Irisan B irisan C = {3,5,7,11,13}