There are 10 one digit positive integers (0 - 9) and 9 one digit negative integers (-9 to -1) making 19 in all.
-23
There are 90 positive two-digit integers, ranging from 10 to 99. This is calculated by subtracting the smallest two-digit integer (10) from the largest (99) and then adding one: (99 - 10 + 1 = 90).
4
the answer would be 900
There are 4500 such numbers.
28
There are 352.
-23
There are 45 integers between 11 and 999999 which consist of only one digit being repeated. There are 831430 integers that contain at least one repeated digit.
90
4 digits - representing 16 integers.
4
There are 8*8 = 64 such numbers.
the answer would be 900
500
There are 4500 such numbers.
54