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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

If the final score in a football match was 3 - 2 how many different possible half time scores are there? For instance 1 - 0 or 0 - 1. Could you give a rule for working out how many half time scores there are just using the final score?

Answer: 12. Add one to each and multiply