MHT CET · Maths · Permutation Combination
A regular polygon has 20 sides. The number of triangles that can be drawn by using the vertices but not using the sides are
- A \(1140\)
- B \(800\)
- C \(340\)
- D \(20\)
Answer & Solution
Correct Answer
(B) \(800\)
Step-by-step Solution
Detailed explanation
Total triangles \( = \binom{20}{3} = \frac{20 \times 19 \times 18}{3 \times 2 \times 1} = 1140 \) Triangles sharing 2 sides \( = 20 \)
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