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

A Perfect Ad

One day I met a friend of mine.
He was a salesman for a Cola company, posted in the Middle East.
Seeing him back home, I got surprised and asked, " Weren't you supposed to be in Arabia ?"
He gave his account thus :- " I got posted in the Middle East. I was very confident that I will make a good sales pitch as Cola is virtually unknown there. But, I had a problem I didn't know to speak Arabic. So, I planned to convey the message through pictures. I made 3 posters
First, A man crawling through the hot desert sand, totally exhausted and panting.
Second, The man is drinking our Cola
Third, Our man is now totally refreshed."
" Thats a very good ad", said I," what can be a problem with it ?"
He replied," Well, I didn't know Arabic, neither did I realize that Arabs read from right to left".