Question 3 Course3 Week 2 (Probability and statistics for machine learning and data science)

For week 2 programming assignment (Probability & Statistics for Machine Learning and Data Science course), I am getting some confusion for question3.
How should we interpret the P for sum=2|8 ?

Thank you

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stuck there too


for example for P(2|8) you need the probability of the sum being 2 (or being 8, because P(2) = P(8)).