# Le Monde puzzle [#824]

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**A** rather dull puzzle this week:

Show that, for any integery, (√3-1)^{2y}+(√3+1)^{2y}is an integer multiple of a power of two.

**I** just have to apply Newton’s binomial theorem to obtain the result. What’s the point?!

Filed under: Books, Kids, R Tagged: Binomial theorem, Isaac Newton, Le Monde, mathematical puzzle

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