RRB NTPC Mains or Stage 2 Model Paper 5 with solutions

Question : 13 of 120

Marks: +1, -0

If three vertices of a regular hexagon are chosen at random, then the chance that they form an equilateral triangle is :

Solution:

^6C_3

ways.

The only equilateral triangles possible are

A_1A_3A_5 and A_2A_4A_6

P=2/{^6C_3}= 2/20= 1/ 10

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