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n(s) = 20 + 16
= 36
peluang kelereng hitam
n(a) = 20
peluang = 20/36
= 5/9
peluang kelereng kuning
n(a) = 16
peluag = 16/36
= 4/9
n(s) = 36
a.n(h) =20
peluang =n(h)/n(s)
= 20/36
= 5/9
b. n(k) = 16
peluag = n(k)/n(s)
= 16/36
= 4/9