Pliss yang tau, tolong bantu jawabbb, ntar gua kasi yang terbaikkk

A = {1, 2, 3, 4, dan 5}
B = {2, 4, 6, 8}
C = {1, 2, 3, 5, 7, 11}

A U B = {1, 2, 3, 4, 5, 6, 8}
n = 7

A n C = {1, 2, 3, 5}
n = 4

= 7 + 4
= 11