Here is a set of problems that I encountered during an examination. Can anybody help me find the numbers where the '??' symbols are?
- $\begin{bmatrix}10&6&2\\15&31&?? \\15&96&7 \end{bmatrix}$
- $\begin{bmatrix}??&6&3\\22&27&43 \\27&108&29 \end{bmatrix}$
- $\begin{bmatrix}36&??&45\\126&12&61 \\45&47&6 \end{bmatrix}$
- $\begin{bmatrix}5&39&39\\41&10&34 \\120&??&30\end{bmatrix}$
I have no clue how to solve this, can anybody help?