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Source: Radio 4's Puzzle for Today (set by Daniel Griller)

Six different (strictly) positive integers are written on the faces of a cube. The sum of the numbers on any two adjacent faces is a multiple of 6.

What is the smallest possible sum of the six numbers?

If you enjoyed this puzzle, check out Sunday Afternoon Maths LXIII,

puzzles about 3d shapes, or a random puzzle.

puzzles about 3d shapes, or a random puzzle.