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Age 14 to 16 Short
Challenge Level
Without using a calculator, or performing any long multiplication calculations, find the value of
$$2017^2-2015\times2019$$
This problem is taken from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.