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A polygon with 25 sides can be triangulated into _______

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A polygon with 25 sides can be triangulated into _______

(a) 23

(b) 20

(c) 22

(d) 21

This question was posed to me in an online quiz.

This key question is from Strong Induction and Well-Ordering topic in division Induction and Recursion of Discrete Mathematics

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Best answer
Correct answer is (a) 23

For explanation: A simple polygon with n sides can be triangulated into n-2 triangles, where n > 2.

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