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P(ketiganya bukan gambar) = 1 - P(ketiganya gambar)
P(ketiganya bukan gambar) = 1 - 1/8
P(ketiganya bukan gambar) = 8/8 - 1/8
P(ketiganya bukan gambar) = 7/8
b. P(dua gambar) = 3/8
P(bukan dua gambar) = 1 - P(dua gambar)
P(bukan dua gambar) = 1 - 3/8
P(bukan dua gambar) = 8/8 - 3/8
P(bukan dua gambar) = 5/8