QJs - a high variance play. Comments please.

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46 cards left, so our odds are 1546-15) = 15:31, which is rougly 1:2 or 33%.

A quicker method for a rough calculation is to take the number of outs and multiply by 4 on the flop or 2 on the turn. So 15x2 = 30%. This undershoots it a bit, so it's reasonable to use for "value" calculations

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Thanks. This makes sense.