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4*sqrt(2)

Rational multiples of Irrational Numbers are irrational.

sqrt(2) is about 1.414, and 5/4 = 1.25 < 1.414... < 1.75 = 7/4 so

4*sqrt(2) is between 5 and 7, and is irrational.

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Q: What is an irrational number between 5 and 7?
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