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dgn diagram Venn dan tertulis...
Gw pake yg tertulis
IMO, IBO, & ICO = 5
IMO, & IBO = 12 - 5 = 7
IBO, & ICO = 8 - 5 = 3
IMO, & ICO = 9 - 5 = 4
IMO = 22 - (5 + 7 + 4) = 6
IBO = 17 - (5 + 7 + 3) = 2
ICO = 20 - (5 + 4 + 3) = 8
tidak mengikuti = 39 - (5 + 7 + 3 + 4 + 6 + 2 + 8) = 4
peluang p(A) = 4/39