There are 120 of them.
Its not 120 digits
There are 125 of them.
How many
There are 2828 integers between 1000 and 9999.
There are 128 integers between 100 and 1000 that are divisible by seven.
There are 1,000 positive integers between 1,000 and 9,999, inclusive, that are divisible by nine.
9*9*8*7 = 4536
952 of them.
An infinite amount
405
10*9*8=720
There are 125 of them.
How many
The sum of all the integers between 1,000 and 2,000 is 1,498,500.
648
There are 2828 integers between 1000 and 9999.
1, 2, 4, 5, 8, and 10, so only 6 digits.
52