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n = 4 orang
x = 3 orang
P(4 dari 3 bayi yng belum di imun) =
= nCx . pˣ. (1 -p)ⁿ⁻ˣ
= 4C3 .(0,1)³ (0,9)⁴⁻³
= 4 (0,001)(0,9)
= 0,00036