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牛人快看之二(最新JJ)
1.In skating, there are 6 female singles, 3 pairs and 5 male singles, in this order and succession,what is the total combination?
2.f(x)=x2 +2x+1, 问f(s) 与f(r)的算术平均值?
(1) r和 s的算术平均值为5;
(2) 0〈=r〈=s〈=10
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此题选E吗?
3.The probability of one product is found to be defective is 0.01, what is the probability that at least one product in 10 products is found to be defective.
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answer: 1-0.99^10 |
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