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biru: b
n(a) = { ppb, pbp, bpp } = 3
n(s) = 3+4 = 7
p(a) = n(a)/n(s)
= 3/7
n(B) = 4
n(s) = 3+4 = 7
diambil 3 bola --> P(2 putih dan 1 biru) = ( 3C2 x 4C1) /(7C3) = 12/35