You can
put this solution on YOUR website! .
One hundred numbers from 100 to 199 having '1' in the hundreds position
plus 8*10 = 80 other numbers from 210 to 919 of the table
210 310 . 910
211 311 . 911
212 312 . 912
... ... . ...
219 319 . 919
having '1' in the tens position,
plus 8*9 = 72 other numbers from 201 to 991 of the table
201 301 . 901
221 321 . 921
231 331 . 931
... ... . ...
291 391 . 991
having '1' in the units position and not having '1' in the tens position.
In all, there are 100 + 80 + 72 = 252 such numbers.
