I bet; you did not know
This is awesome - I bet you didn't know this
Letters 'a', 'b', 'c' & 'd' do not appear anywhere in the spellings of 1 to 99
(Letter 'd' comes for the first time in Hundred)
Letters 'a', 'b' & 'c' do not appear anywhere in the spellings of 1 to 999
(Letter 'a' comes...