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To determine how many heptagons can be formed by joining the vertices of a 10-sided polygon, we can use the combination formula. Specifically, we need to choose 7 vertices from the 10 available. This is calculated as ( \binom{10}{7} ), which is equal to ( \binom{10}{3} ) (since choosing 7 vertices to include is the same as choosing 3 vertices to exclude). Thus, ( \binom{10}{3} = \frac{10!}{3!(10-3)!} = 120 ). Therefore, 120 heptagons can be drawn by joining the vertices of a 10-sided polygon.

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