Maths gaff or just really bad reporting? Daily Express. "PAUL MCCARTNEY is one third of one of the most famous bands in the world." https://www.express.co.uk/life-style/health/1523439/Paul-mccartney-health-depression-symptoms
There's a weird sentence a few lines down the article which makes it look like they initially forgot about George Harrison.
You're not supposed to read it. It's the Express. (In my defence, it was my wife tutting that brought this one to my attention.)
Let's face it most of the Express readership would not remember how many band members were in the Beatles. Anyway they would be more interested in the weather headlines they recycle every week.