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S, U, N are collinear. Select the point that satisfies the definition of betweenness if NU + US = NS.

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Answer: Point U is between points N and S.

The order S, U, N shows U is in the middle. We can read this in reverse to get N, U, S.

Notice how the letter "U"s are adjacent in NU and US to get NU+US.

User Elad Weiss
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