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A regular polygon has 20 sides. How many...

A regular polygon has 20 sides. How many triangles can be drawn by using the vertices, but not using the sides?

A

`.^(20)C_(1)..^(16)C_(2)`

B

`(.^(20)C_(1)..^(16)C_(2))/(3)`

C

2400

D

800

Text Solution

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The correct Answer is:
A
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