What is the probability of getting an isosceles triangle by joining 3 vertices of a regular hexagon?
A) 3/10
B) 3/5
C) 1/2
D) 2/5
E) None of the above
A) 3/10
B) 3/5
C) 1/2
D) 2/5
E) None of the above
No of triangles possible = 6C3 = 20
No of Isosceles triangle possible = 6 because you'll have to have the adjacent sides of equal length. that's only possible if two adjacent sides of the hexagon form the the two equal sides of the isosceles triangle..
so probability = 6/20 = 3/10
Answer = 3/10
