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Imagine a pandas dataframe called cases, that has three columns: DATE, STATE and NEW _ CASES. There is a row for every state's reported COVID

Imagine a pandas dataframe called "cases", that has three columns: DATE, STATE and NEW

_

CASES. There is a row for every state's reported COVID cases for every day since March

1, 2020 .

You want to find out the number number of states that reported any cases for each day. Which line of code would achieve this:

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