the 4-2 rule is the quickest way imho. Figure #of outs. 2 cards to go, x4, river to go, x2. Like open ended straight = 8 outs, chance of hitting by river = 32% roughly (8x4).
After turn chance of hitting = 16% (2x8). More important is minusing outs like ones that would complete flushes or make straights against your hand or low pairs, etc. This is the hard part.
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