This one is common sense, not math.
You can't possibly get a 5 and a green face on the same roll, because all of the odd numbers are red. Each condition rules out the other one. That's called being "mutually exclusive".
Feeling unsure about math is a common experience among students. To improve, identify the specific area you're struggling with, review the basics, practice regularly, and seek help if needed. Persistence and using resources can significantly enhance your understanding and confidence in math.
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[tex]5\% \times 50.000.000 \\ = \frac{5}{100} \times 50.00.000 \\ \\ = \frac{250.000.000}{100} \\ \\ = 2.500.000[/tex]