If you include the number 3,000, there are exactly 2,001 4-digit numbers between 500 and 3000.
There are 156 such numbers.
500
There are 232 numbers between 1 and 500 that are divisible by 3 or 5.
There are 43 natural numbers between 200 and 500 that are divisible by seven.
If you include the number 3,000, there are exactly 2,001 4-digit numbers between 500 and 3000.
The 3 digit numbers under 500 are 100 through 499.
9
1000 to 2999 inclusive so 2000 numbers.
If you mean 3-digit numbers whose digits are in decreasing order, then the answer is 20.
There are 156 such numbers.
500 or so.
625 if numbers can have leading 0s, 500 otherwise.
There are 6,750 such numbers.
500
110...... 500 to 599=100 405.415 till 495
450... There are 500 odd numbers from 000 to 999 inclusive. From 000 to 099, there are 50 odd numbers. 500 - 50 = 450.