The words "P U G F O R S A L E" are written on a store window. How many of these ten letters look the
same when viewed from both sides of the window?
, 2025
Pick one
Solution
When viewed from the opposite side of the window, text appears
reflected horizontally.
That is, P U G F O R S A L E appears
as . The letters that look the same when viewed from both sides of the
window are A, O and U and so there are such letters.
Want a route through all this instead of an archive? The track
puts 2,444 problems in a working order, from Junior Challenge level to the IMO shortlist.