Question 3: What year when written in Roman numerals uniquely contains one each of the Roman number symbols in descending order?
Answer: 1666 = MDCLXVI (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1.)
Winner: Abhishek Agarwal, The Hongkong and Shanghai Banking Corporation Limited