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|A∪B∪C| = |A| + |B| + |C| - |A∩B| - |A∩C| - |B∩C| + | A∩B∩C|
anggap bahwa keseluruhan siswa = 77 %
77 = 30 + 20 + 50 - |A∩B| - |A∩C| - | B∩C| + 3
77 = 103 - |A∩B| - |A∩C| - |B∩C|
a. memilih lebih dari 1 channel = 26%
b. memilih hanya satu atau ketiganya. = 77- 26 = 51%
semoga bermanfaat,
selamat belajar.