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Dublin: 8 °C Thursday 20 February, 2020

Take a break and try to solve this intense locker riddle

A little maths to shake up your morning.

PICTURE THE SCENE: a room full of lockers, with a single word in each.

You’ve been brought here with 99 relatives to try solve a puzzle set by a rich, now dead uncle as part of his will. The first person who cracks the challenge will get his full inheritance.

Someone in the group is told to open all 100 lockers in the room. Another then has to close every second locker, before a third person closes those left open and opens the closed, in a pattern that continues until you’ve all had your turn.

The words in the lockers that are left open at the end will help you figure out the code that opens the safe – but is there a way to solve the problem before you all get started? Ted-Ed explains.

Source: TED-Ed/YouTube

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