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25 suka tari gambyong
20 suka tari srimpi
7 suka keduanya
siswa yg hanya suka tari gambyong :
25 - 7 = 18
siswa yg hanya suka tari srimpi :
20 - 7 = 13
banyak siswa yg tdk suka keduanya :
50 - (13 + 18 + 7)
50 - 38 = 12 siswa