In Hansens book "Every Hand Revealed", he discusses a hand where he has a monster draw. His cards are Th9h. The flop comes.....
8h, 7h, 5c
He says he is 43% against a set. Two different hand calculator I use both show 42% against 88. So I am satisfied that is the right answer.
I've tried the calculations by hand a couple of different ways and I keep getting 40%. Although an insignificant difference for practical purposes -- it's inside my head wrecking havoc so I'd like to resolve it and a get it right.
Any help would be greatly appreciated.

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