Tournament Poker for Advanced Players

[Nemesis_]

I'm reading the book and I came across this:

The author has a system for beginner no limit tournament players. He taught it to a female player as follows:

1. If someone else has raised in front of you, move in all your chips with aces, kings, or ace-king suited. Otherwise fold.
2. If not one else has raised in front of you, move in all your chips with any pair, any ace-other suited, ace-king(suited or offsuit), or two suited connected cards, except for four-trey or trey-deuce. [123]

He goes on to elaborate, "Notice that the hands that she was to move in with(again, when no one raised in front of her) comprised about 13 percent of all the two card cominations.(If you don't know how I got that, stop reading this book right now. You are not ready for it. You don't know enough about poker. And, you deserve to lose.)" [124]


"Notice that the hands that she was to move in with(again, when no one raised in front of her) comprised about 13 percent of all the two card cominations.(If you don't know how I got that, stop reading this book right now. You are not ready for it. You don't know enough about poker. And, you deserve to lose.)" [124]

How did he get that? why only 13%?

Thanks in advance