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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.The Association of Teachers of Mathematics

If you have sticks which measure 1, 2, 3, 4, 5, 6, 7, 8 and 9 cm (one of each) how many different triangles could you make using three of the sticks?

Answer: 34

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