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单选题
A password is made up of two letters followed by two single-digit numbers. If a person is assigned a password at random, what is the probability, rounded to the nearest hundredth, that the password uses only even digits for the numbers?
A
0.25
B
0.35
C
0.5
D
0.15
E
0.1
参考答案
参考解析
解析：
There are a total of 26 ×26 ×10 ×10 = 67,600 possible passwords, of which 26 ×26 ×5 ×5 = 16,900 use only even digits. P (even digits)= 16900/67,00==0.25
There are a total of 26 ×26 ×10 ×10 = 67,600 possible passwords, of which 26 ×26 ×5 ×5 = 16,900 use only even digits. P (even digits)= 16900/67,00==0.25
更多 “单选题A password is made up of two letters followed by two single-digit numbers. If a person is assigned a password at random, what is the probability, rounded to the nearest hundredth, that the password uses only even digits for the numbers?A 0.25B 0.35C 0.5D 0.15E 0.1” 相关考题
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