60 numbers
There are 6,750 such numbers.
81 of them.
500
There are 450 of them.
There are 720 of them.
8100
The 3-digit counting numbers are 100 through 999 = 900 numbers.Half them are multiples of 2 (even numbers).The other half are not . . . 450 of them.
4500 of them.
There are 9*10*9 = 810 such numbers.
5 ans 3
45 multiples of 2 plus 30 multiples of 3 minus 15 multiples of 6 equals 60 numbers