Encode and Decode Messages
-Use the Coding Matrix $A = \left[ \begin{array} { r r r } 1 & 1 & 1 \\ - 1 & 1 & 2 \\ 1 & 2 & 3 \end{array} \right]$

Multiple Choice

Encode and Decode Messages
-Use the coding matrix $A = \left[ \begin{array} { r r r } 1 & 1 & 1 \\ - 1 & 1 & 2 \\ 1 & 2 & 3 \end{array} \right]$ and its inverse $A ^ { - 1 } = \left[ \begin{array} { r r r } - 1 & - 1 & 1 \\ 5 & 2 & - 3 \\ - 3 & - 1 & 2 \end{array} \right]$ to decode the cryptogram $\left[ \begin{array} { l l l } 37 & 16 & 35 \\ 38 & 20 & 4 \\ 82 & 40 & 60 \end{array} \right]$ .

A) GOOD_LUCK
B) STAY_CALM
C) LOOK_DOWN
D) HELP_THEM