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3 out of 6 vertices of a regular hexagon...

3 out of 6 vertices of a regular hexagon are chosen at a time at random. The probability that the triangle formed with these vertices is an equilateral triangle , is

A

`(1)/(5)`

B

`(2)/(5)`

C

`(1)/(10)`

D

`(1)/(20)`

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The correct Answer is:
C
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