I see people make this mistake all the time. If you're outnumbered, RUN AWAY. You ain't gonna outgun 3 people. You're foolish to think you have enough DPS to match 3 people. I don't care how good your guns are. I don't care how smart you are. You're not gonna win. RUN!
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This is not a statement of fact, because there are a lot of reasons you might win against 3 players. 1) Only 1 is shooting you at a time. 2) You have damage resistance or healing advantages. 3) You weaken them using grenades. 4) You have a kill perk active. 5) They are absolutely awful and miss a lot of shots. 6) You are outside their weapons' effective ranges. 7) Trading would be favorable, and you can get one. 8) You are not going for a kill, just weakening them for your team before returning to cover. 9) You have cover and they don't. 10) You have cover, and your teammates can cover you if they push.