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SAT Math Practice Question #29186 - SATify | SATify

#29186

probability

combinatorics

geometry

medium

120 sec

From a regular decagon, a triangle is formed by connecting three randomly chosen vertices of the decagon. What is the probability that at least one of the sides of the triangle is also a side of the decagon?

A.

$\frac{2}{5}$

B.

$\frac{7}{12}$

C.

$\frac{3}{10}$

D.

$\frac{1}{2}$

E.

$\frac{11}{20}$