Main content

Puzzle for Today

Puzzle No. 408 – Monday 4 February

50 years ago last Wednesday in 1969, was the final public performance of the Beatles, taking place on a London rooftop. The main four members (John Lennon, Paul McCartney, George Harrison and Ringo Starr) were joined by keyboardist Billy Preston. If all five participants did a final handshake with each other to part ways, how many handshakes would there be in total?

Today’s #PuzzleForToday has been set by Bobby Seagull, a school Maths teacher and Cambridge University Doctorate student.

Click here for the answer

10 handshakes. The first person shakes hands with 4 people. The second person with 3 people. The third person with 2 people. Then the fourth with 1 person. This totals 4 + 3 + 2 + 1 = 10.

More fiendish brain-teasers and quizzes on BBC Radio...