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Can anyone confirm thats correct?
I can confirm that is not correct.
If you needed 20% equity, and were getting 3:1, then you would just need another 1:1, which in this case is 40 cents. Note, you will need to make this on the river 100% of the time, but we can also settle for making 80 cents 50% of the time, or some combination of amounts some percentage of the time that total 40 cents in expected value or more.
But if villain has a king, we can win with three aces and nine diamonds. Let's say villain has KJ of spades. So that is 12 outs, we know 8 cards, so there are 44 left, we like 32:12 or 2.7:1 against. So we would have a 27% chance of hitting the river. Of course we should discount our ace outs for sure, and probably our flush outs, since a full house is already possible, so maybe your 20% estimate wasn't so bad after all.