Explanation lesson Built-in Objects semantics problem

In the lesson Built-in Objects I do not understand the highlighted part, I suppose it includes the zero and excludes the one because it appears adjacently respectively within brackets inclusive and exclusive regarding zero and one, that’s right?

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Also, evaluate means mathematically belonging to the same equivalence class or it means finding a numerical expression?
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  1. Since we’re in the world between 0 and 1, you are correct: It will generate a random decimal between 0 (which could be 0 - inclusive), and 1 (which can’t be 1 - exclusive). So if we look at it as percentages .random()*100, you can have 0% thru 99%, but not 100%.

  2. Which function is this in reference to? In this case, it appears to mean the same as return: It will likely output a decimal.

I updated, so it means output?

In this case, yes. Math.random() by default outputs a decimal between 0 and 1, so when it’s multiplied, it often remains a decimal unless rounded (as they suggest here).