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a. ketiganya hijau = 9C3 / 24C3 = 84 / 2.024 = 21 / 506
b. 2 kuning 1 biru = 8C2 7C1 / 24C3 = 28 x 7 / 2.024 = 196/2.024 = 49 / 506
c. beda warna = 9C1 8C1 7C1 / 24C3 = 9 x 8 x 7 / 2.024 = 504 / 2.024 = 63 / 253