Example (Texas hold'em) Alice holds 5-4 of clubs. The board on the turn is Queen of clubs, Jack of clubs, 9 of diamonds, and 7 of hearts. Her hand will almost certainly not win at showdown unless one of the 9 remaining clubs comes on the river to give her a flush. Excluding her two hole cards and the four community cards, there are 46 remaining cards to draw from. This gives a probability of 9/46 (19.6%). The rule of 2 and 4 estimates Alice's equity at 18%. The approximate equivalent odds of hitting her flush are 4:1. Her opponent bets $10, so that the total pot now becomes, say, $50. This gives Alice pot odds of 5:1. The odds of her hitting her flush are better than her pot odds, so she should call.
eXamPle (Texas hold'em) alice HOlds 5-4 oF clUbs. tHe bOaRD on The turn Is queEn of cluBs, jACk of cluBS, 9 Of diAmonDS, aNd 7 oF hEarts. her hAnd wiLl aLMOst CErtAInlY not Win At showdown unLEsS one of the 9 reMAIninG clUbs comes On tHE RiVEr tO Give hER a flUsh. excluding her tWo hOLe carDs aNd tHe four comMuNitY carDs, tHere aRe 46 remAiNInG cArds to dRaW frOm. this givEs a PRobaBilITy of 9/46 (19.6%). the RulE oF 2 AnD 4 estimatES aLiCe's eQuity at 18%. the appRoXimatE EquiVaLEnT oddS of hiTtIng Her FlUsh arE 4:1. hEr oppONent betS $10, so That tHE TOtaL pOt nOW becomes, Say, $50. tHis Gives AliCe pot OdDS Of 5:1. the odds of her hittinG HEr flusH arE beTTer tHaN hEr pOT oDds, sO ShE sHoUld call.