-23
4
There are 4500 such numbers.
the answer would be 900
Positive integers are greater than negative integers. For positive integers: * The integer with more digits is larger. * If two integers have the same length, compare the first digit. If the first digit is the same, compare the second digit, then the third, etc., until you find a difference. In each case, the integer with the larger digit (at the first position where you find a difference) is the larger one.
28
90
500
There are 8*8 = 64 such numbers.
10 times for the one's digit, 1-100 10 times for the ten's digit, 60-70 = 20 times
17
48
72 is one
18 positive integers and 36 integers (negative and positive)
362880 is one possibility.
There are 3168 such numbers.
There are 5.