You may have seen this before, but it is still awesome - I did not know this.
The letters 'a', 'b', 'c' & 'd' do not appear anywhere in the spellings of numbers 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!
Dr. Vijay Pithadia, FIETE, PhD, MBA Director - MBA, 5 PhDs Guided, Author of 6 Books, Google Scholar Citations - 90, h-index - 5, M: +91 9898422655 UGC/Scopus/Web of Science Publication: 30, Referred/Peer Reviewed Publication: 63, Chapters Published In Books: 12, Full Papers Published in Conference Proceedings: 21, Patent Published: 3, Invited Lectures and Chairmanship etc.: 41, Conference Organized: 4, AICTE faculty ID: 1-24647366683