In his book "The poker face of Wall Street", A.Brown wrote this:
"If two hands have two different cards ten or higher, there is a 62% chance they share a card of the same rank.
If two hands are pairs or suited connectors, there is only a 7% probability they share a card of the same rank.
If they are both suited hands, there is only a 19% chance they share the same suit."
How did he find these numbers?