Poker workbook for math geeks - flop math - percentage calculated
Another question from the flop math chapter (again on page 248)
Flop: 7s 7h 10d
Player 1: 7c 8d
Player 2: 8h 9h
So I count 8 outs for player 2 (up and down straight draw). I multiply by 4, so 32% and then I give back 30% of the equity to sets (as stated in the add ons to the rule of 4).
Eventually I had 23% (32-9).
The answer key says 28% however.
When I use this tool: https://www.pokernews.com/poker-tools/poker-odds-calculator.htm it agrees with the 28%.
What am I doing wrong?