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      ?

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)?

 [Ref: ZWNJ] © Kevin Stone


A. 1987.

B. 1432.

C. 2031.

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