How many three-digit positive integers are odd and do not contain the number 5?
First of all, there are 900 three-digit numbers from 100 to 999, half of which are odd and half are even, so the odd number is 450.
Among them, 500 digits account for 1/9, and 50 digits are a * * *, leaving 400 after being removed.
Among the remaining figures, ten digits are 5, accounting for110, and one * * * is 40, leaving 360 after being removed.
Among the remaining numbers, the number with five digits accounts for 1/5, and the number with a * * * is 72, leaving 288 after being removed.
So there are 288 such three digits to satisfy the meaning of the question.
There are 288 positive integers with three digits.
If the landlord has any unclear questions, I hope it is useful. Thank you for adopting _