Do you know,







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 for the first time in Thousand )





Letters 'b' & 'c' do not appear anywhere in the spellings of 1 to 999,999,999




( Letter 'b' comes for the first time in Billion )





And



Letter 'c' does not appear anywhere in the spellings of entire English Counting