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If four vertices a regular octagon are chosen at random, then the probability that the quadrilateral formed by them is a rectangle is

If four vertices a regular octagon are chosen at random, then the probability that the quadrilateral formed by them is a rectangle is

If four vertices a regular octagon are chosen at random, then the probability that the quadrilateral formed by them is a rectangle is

If four vertices a regular octagon are chosen at random, then the probability that the quadrilateral formed by them is a rectangle is

Three of six vertices of a regular hexagon are chosen at random. Tie probability that the triangle formed by these vertices is an equilateral triangle is

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

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

Three of six vertices of a regular hexagon are chosen at random. What is the probability that the triangle with these vertices is equilateral ?