2 diagonals of a regular heptagon (a 7-sided polygon) are chosen.  What is the probability that they intersect inside the heptagon?
Question:
2 diagonals of a regular heptagon (a 7-sided polygon) are chosen.  What is the probability that they intersect inside the heptagon?
Answer:
Let's think step by step.

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\dfrac{5}{13}
2 diagonals of a regular heptagon (a 7-sided polygon) are chosen.  What is the probability that they intersect inside the heptagon?
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