6 Mark H 3 years ago / 868 Views 000You have entered the Matrix. Part of your new job is to decipher random letters. What is the next letter in the sequence? Answer E for eight. The letters are the initial letters of the written numbers, one, two, three etc. 6 Categories Tags Series Related Articles Author Mark H › Stating the obvious here, but I enjoy riddles & puzzles. Anyone else also struggling with seemingly simple 5th grade math problems?