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peluang yang terpanggil osis = 10/45 = 2/9
peluang yang terpanggil pengurus kelas = 16/45
= 16 + 10 + 23 -4
= 45
peluang osisi
p(A) = (10+4) / 45
= 14/45
p(A) = (16 + 4 ) / 45
= 10/45