NL Preflop Question

[Grasshoppa]

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I did the math by hand (posted above) and got -30. It's cool that are answers are so similar.

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I would say you did a very rough estimation of what the math would be. There are so many different types of flops to consider with non-obvious results, and the question of which flops to push with is only vaguely addressed, and yet it's crucial, especially since you have to push with some flops that are slightly negative EV. Still, you came pretty close!