Question

A. The year 2013 uses four different digits. When did this last happen?

B. The digits in 2013 form a sequence (0, 1, 2, 3). When did this last happen (not necessarily the same digits)?

C. The digits in 2013 form a sequence (0, 1, 2, 3). When will this next happen (not necessarily the same digits)?

Answer 1

A. 1698
B. The year 0123
c. 3012