Solve : What does (!) dohere??

1.	Solve : What does (!) dohere??
Answer» What does (!) do here? (!a ) Means not 500? or it CHANGE the value 500 ( TRUE ) to false? Its a function that is INVERSE so instead of true false or instead of false true as seen here https://teamtreehouse.com/community/what-does-the-means-if-its-before-a-variable

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