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Bab : Himpunan
Jumlah siswa = 38 anak
Mengikuti basket = 25 anak
Mengikuti volly = 21 anak
Mengikuti keduanya = x
25 - x + x + 21 - x = 38
-x + 46 = 38
x = 46 - 38
x = 8 anak