Probability?
2016-11-01 6:19 pm
A telephone number consists of 8 digits. Each digit is an integer from 0 to 9 inclusive. The first digit must be 2,3,6 or 9. If a telephone number is chosen randomly, what is the probability that the telephone number chosen consists of 8 different digits?
回答 (1)
2016-11-02 10:51 am
✔ 最佳答案
4 * P(9,7) / [ 4 * 10^7 ]= P(9,7) / 10^7
= 9*8*7*6*5*4*3 / 10^7
= 0.018144 ..... Ans
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161101101943AA5KYNj