Dibikeun: ``` 30 total siswa = U 13 ucing siswa = C 10 ucing siswa = D 4 ucing jeung ucing siswa = CD ````) Ngagunakeun set matematika, urang bisa manggihan sakabéh grup lianna. ``` C^c = euweuh ucing siswa = 30-13 = 17 D^c = euweuh ucing siswa = 30-10 = 20 ucing jeung euweuh ucing siswa = CD^c = C\D = C\\(CD) = 13-4 = 9 ucing jeung euweuh ucing siswa = DC^c = D\DC) = 10-4 = 6 sagala petdetns = CD = CD^c  DC^c  CD = 9 + 6 + 4 = 19 ucing ucing = U-CD = 30 - 19 21 = 21 ` ` ` 
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