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参考公式: 1.如果事件A,B互斥,那么 P(A+B)=P(A)+P(B). 2.如果事件A,B相互独立,那么 P(A·B)=P(A)·P(B). 3.如果事件A在一次试验中发生的概率是p,那么n次独立重复试验中恰好发生k次的概率 Pn(k)=Cnkpk(1-p)n-k 4.正棱锥、圆锥的侧面积公式
Reference formula: 1. If events A and B are mutually exclusive, then P(A+B)=P(A)+P(B). 2. If events A and B are mutually independent, then P(A·B)=P (A)·P(B). 3. If the probability of event A occurring in one trial is p, then the probability of exactly k occurrences in n independent repeated trials is Pn(k)=Cnkpk(1-p)nk 4 The formula of the side area of the positive pyramid and cone