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A baseball league has Nt eams, and each team plays with every other team twice.There are a total of 90 games in a season. How many teams are there?

 Feb 7, 2021
 #1
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2*(1+2+3+4+5+6+7+8+9)=90, 9

 Feb 7, 2021
 #2
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Tell me if it's correct

 Feb 7, 2021
 #3
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Wait, but what is the answer? Is it 9, or 90?

 Feb 8, 2021

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