There are 72,000 five-digit numbers that are not divisible by 5.
According to the provided reference, there are 90,000 different five-digit numbers, ranging from 10,000 to 99,999. Of these, 18,000 are divisible by 5. This is determined by dividing the total number of five-digit numbers (90,000) by 5. To find the number of five-digit numbers not divisible by 5, we subtract the number of those divisible by 5 from the total number of five-digit numbers:
- Total five-digit numbers: 99,999 - 9,999 = 90,000
- Five-digit numbers divisible by 5: 90,000 / 5 = 18,000
- Five-digit numbers not divisible by 5: 90,000 - 18,000 = 72,000
Therefore, 72,000 five-digit numbers are not divisible by 5.
