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Multiples of 11

Anna loves multiples of 11. Bibi is not quite so keen. One day Anna is flipping idly through the yellow pages (full of 10-digit numbers including area codes), and notices that every number seems to have the interesting property that … Continue reading

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Paratroopers Riddler

From this week’s Riddler column, slightly reworded for clarity: “During their descent, three paratroopers were blown off course and crash-landed in the desert — an infinite, uniform, two-dimensional plane. They come to at a random time after the crash … Continue reading

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