Why do MLB teams play 162 games?

Why do MLB teams play 162 games? So baseball decided to add 8 additional games to the season so one team could play all 9 of their opponents 18 times (9 opponents x 18 games = 162 games).

So baseball decided to add 8 additional games to the season so one team could play all 9 of their opponents 18 times (9 opponents x 18 games = 162 games).
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