Originally Posted by dj11
Add to that the possible pairs, and you got over 20 (27 if every card was still live) . Hell, that means over half the outstanding deck will make you a hand with at least a pair. And 15 of those will make you the str8 or flush.
Bet this hand
Indeed and hence the "usually" but I'm assuming that we need to beat a pair or are talking likely "live" outs. If you hold the top end of the straight flush draw then potentially it could be 21 outs if you are up against an underpair with no cards of your suit.
ie KhQh and the board is JhTh3s versus 8s8c.