Sunday Times Teaser 2750 – Granny’s Birthday
by Graham Smithers
Published: 7 June 2015 (link)
At Granny’s birthday this year she was telling us some surprising things about some past birthdays. She told us that each year she writes down the date of her birthday (in the eight-digit form dd/mm/yyyy) and her age in years. On two occasions in her lifetime it has turned out that this has involved writing each of the digits 0 to 9 exactly once. The first of these occasions was in 1974.
What is Granny’s date of birth (in the eight-digit form)?