Solution to Problem 263

Solution to Problem 263

Correct solutions came from Rafael Stern, USA; Allen Druze, USA; Paul Kohnen, Bradley University; Burkhart Venzke, Germany; Jerome Cherry, USA; Bill Webb, USA; Rob Andry, Bradley University; Brett Hendricks, USA; David Stigant, USA; A. Teitelman, Israel; Ron Welch, USA; Farid Lian, Colombia.

For the date to be ambiguous, the day must be within the first twelve days of the month, while the day and the month must be different. There are 12·12 - 12 = 132 such.

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