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n(S)= 15 + 10 + 6=31
bola setelah diambil 1 merah
n(S)=31-1= 30
peluang bola hijau
n(A)=6
P(A)= n(A)/n(S)
=6/30
=1/5
= 30
hijau n(a) = 6
p(a) = 6/30
= 1/5