The puzzles you’re meant to get wrong

Why do some puzzles make us immediately leap to the wrong conclusion?

That’s the subject of Alex Bellos’ new book Think Twice, which has page after page of questions designed to deceive.

Alex sets Tim Harford some of his favourite puzzles.

Presenter: Tim Harford Series producer: Tom Colls Production co-ordinator: Katie Morrison and Janet Staples Sound mix: Donald MacDonald Editor: Richard Vadon