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X \sim Bin(5, 0,3) 。 P(X = 2) ？（答： \binom52 * 0,3^2 * 0,7^3 approximately equals 0,309 。）
X \sim Bin(5, 0,3) 。 P(X = 2) ？（答： \binom52 * 0,3^2 * 0,7^3 approximately equals 0,309 。）
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