Question

Four usual dice are thrown on the ground. The total of numbers on the top faces of these four dice is $13$ as the top faces showed $4,3,1$ and $5$ respectively. What is the total of the faces touching the ground?

• A. $12$
• B. $13$
• C. $15$
• D. Cannot be determined

Answer 1

The correct option is C $15$

In a usual dice, the sum of the numbers on any two opposite faces is always $7$. Thus, $1$ is opposite $6,2$ is opposite $5$ and $3$ is opposite $4$.
Consequently, when $4,3,1$ and $5$ are the numbers on the top faces, then $3,4,6$ and $2$ respectively are the numbers on the face touching the ground. The total of these numbers $=3+4+6+2=15$.