For the 5 digit number 6XXXX, find:
(a) Probability that the 4 unknown digits are all different?
(b) Probability that the 4 unknown digits are either 1,3,5 or 7. Each number can appear more than once.
Probability
2010-10-02 3:32 am
回答 (1)
2010-10-02 3:57 am
✔ 最佳答案
a)For 4 unknown digits are all different , 10P4 = 5040 ways ,All possible of 4 unknown digits , 10^4 = 10000 ways ,P(E) = 5040 / 10000 = 63/125b) All possible of the 4 unknown digits are either 1,3,5 or 7 : 4^4 ways.P(E)= 4^4 / 10^4= 256/10000= 16/625
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