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B = {2, 3, 5, 7}
A - B = {1, 3, 5, 7, 9} - {2, 3, 5, 7}
A - B = {1, 9}
Jawaban: B
13. Jadi, banyak siswa yg menyukai matematika dan olahraga ada 8 siswa.
(cara di gambar)
B = {2, 3, 5, 7}
A - B : himpunan A yang tidak ada di B
A - B = {1, 9}
13. 20 - x + x +23 - x + 5 = 40
48 - x = 40
- x = - 8 negatif nya dicoret
x = 8