Paradox or no?

[AaronBrown]

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so we are making the assumption that we know his range as a fact? Then, given his known range what the perfect hands to play against him are?

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I think the question assumes that we know his range as a fact, but is not asking the perfect hands to play against him, just what is the equity (the profit if both players go all-in heads up) from either playing the same range or subtracting hands from it.