77 vs 55
Preflop odds, heads-up Texas Hold'em
77
7♠7♥
80.6%
55
5♦5♣
19.4%
77 is the favorite: it wins about 80.6% of the time against 55 when both hands go to showdown, with ties 1.3% of runouts.
Computed from 400k simulated deals with the hands shown above.
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