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kelereng merah:9
kelereng biru:6
kelereng putih:5
dit:diambil secara acak,peluang terambilnya kelereng berwarna biru?
jwb:
6C1
20C1
kita sederhanakan terlebih dahulu,
6C1=6!(6 faktorial)
1!
=6
20C1=20!
1!
=20
jadi 6C1 = 6 = 3
20C1 20 10
jadi 3/10 peluang terambilnya kelereng biru.