Amazing Maths (have a look pls)

We have never looked at this strange and interesting point and
unfortunately such things never being tought in the school,
but it is true, lets check it out......... ......... .


Letters 'a', 'b', 'c' & 'd' do not appear anywhere in thespellings 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 to999 (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)

AndLetter 'c' does not appear anywhere in in the spellings of entireEnglish Countingisnt it amazing