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This is also widely known as The Locker Problem - we liked the light switches better!

More Ben Sparks on Numberphile: http://bit.ly/Sparks_Playlist
Ben Sparks on the Numberphile Podcast:    • The Happy Twin (with Ben Sparks) - Nu...  

Ben's website: https://www.bensparks.co.uk
Ben's YouTube channel:    / @sparksmaths  

Highly Composite Numbers:    • 5040 and other Anti-Prime Numbers - N...  

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