turkey-yks 2016 Q19

turkey-yks · Other · lys1-math Probability Definitions Finite Equally-Likely Probability Computation

In the figure, 3 of the 6 edges of a regular tetrahedron are randomly painted.
Accordingly, what is the probability that all three painted edges are on the same face?
A) $\frac { 1 } { 2 }$
B) $\frac { 1 } { 3 }$
C) $\frac { 1 } { 4 }$
D) $\frac { 1 } { 5 }$
E) $\frac { 1 } { 6 }$

In the figure, 3 of the 6 edges of a regular tetrahedron are randomly painted.

Accordingly, what is the probability that all three painted edges are on the same face?\\
A) $\frac { 1 } { 2 }$\\
B) $\frac { 1 } { 3 }$\\
C) $\frac { 1 } { 4 }$\\
D) $\frac { 1 } { 5 }$\\
E) $\frac { 1 } { 6 }$

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