Permutation & Combination · Question 11 · Medium
How many diagonals does a polygon with 10 sides have?
- 40
- 45
- 70
- 35
Answer and explanation
Answer: D. 35
Explanation: Lines joining any 2 vertices = 10C2 = 45. Subtract the 10 sides: 45 − 10 = 35 diagonals.
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