OK then. I'm sceptical about the stats in this article
www.bbc.com/news/articles/c748kmvwyv9oThere would be a 5% chance that a single chimp would successfully type the word "bananas" in its own lifetime.
I reckon they've misused probability by assuming that chimpanzees would hit random keystrokes with a computer level of randomness. IMO the chimps wouldn't dance their fingers all over the keyboard, but would tend to strike adjacent keys more than distant ones.
A and S are adjacent as are B and N. If those were the only keys available, bananas should come up at 1/4pwr7 = 1/16384, but since they are pairs, the case can be made for 1/2 pwr7 = 1/128.
It's certainly not 1/(however many keys there are on a standard keyboard)pwr7.
If we said it's just the letters A-Z the odds would be 1/8031810176. At 1 keystroke/sec a 5% lifetime probability would imply chimps live 12 years, but they live 30-40 years in captivity.