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kotak 2 > peluang merah = 3/10 peluang kuning = 7/10
ketika diambil ke kedua kotak
dapat sama merah = 3/5 . 3/10 = 9/50
dapat sama kuning = 3/5 . 7/10 = 21/50
peluang terambilnya bola berwarna sama adalah...
9/50 + 21/50 = 30/50 = 3/5