单选题How many positive 3-digit integers contain only odd digits?A15B75C125D225E500
单选题
How many positive 3-digit integers contain only odd digits?
A
15
B
75
C
125
D
225
E
500
参考解析
解析：
根据题干可知三位数可以从1,3,5,7,9中选出。因为3位数字可以独立的选择，所以三位数字可为5×5×5=125，故选C。
根据题干可知三位数可以从1,3,5,7,9中选出。因为3位数字可以独立的选择，所以三位数字可为5×5×5=125，故选C。
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