[Madzger]

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how often does 75s actually flop anything worth bet-calling?

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Suited 1-Gapper
7.01% OESD+
10.63% FD+
1.15% OESD+ & FD+
3.49% TwoPair+
_____
22.29%

OESD+ = oesd, double gutter or straight (but no FD+)
FD+ = flush draw or flush (but no OESD+)
TwoPair+ = 2pair, trips, fh, quads

haven't calculated this myself, but source should be reliable

edit:
and for A2s:
Suited 3-Gapper
0.83% Straight
11.63% FD+
0.15% Straight & FD+
3.49% TwoPair+
--------------------
16.10%

88:
Pocket Pair
11.76% Set+
--------------------
11.76%

that's obviously not an answer to the question