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Peluang terambil kelereng merah
7C2 = 7! / 5!2! x 3C2 = 3! / 2!
7C2 x 3C2 = 21 x 3
peluang seluruh kejadian :
10C4 = 10! / 6! 4! = 210
Jadi peluang seluruhnya 63 / 210 = 3 / 10