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BrainTwister #10: Chairs in pairs

Can you solve this week’s logic puzzle? Plus our quick quiz and the answer to last week’s problem

By New Scientist

6 March 2024

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

#10 Chairs in pairs

Set by Peter Rowlett

Abbie and Bryn are allocated places to sit at random in a row of four seats. What is the probability that they are put next to each other?

What if there are 20 seats?

On a different occasion, Abbie and her friend Ana have booked two adjacent spots on the front row, which is 22 seats long. Bryn and his friend Beth also have two adjacent seats among the 22. What is the probability the two groups are next to each other?

Solution next week

#9 Rectangulator

Solution

From the 7, we…

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