Encode and Decode Messages
Encode or Decode the Given Message $A = \left[ \begin{array} { l l } 2 & 1 \\ 5 & 3 \end{array} \right]$

Multiple Choice

Encode and Decode Messages
Encode or decode the given message, as requested, numbering the letters of the alphabet 1 through 26 in their usual
order.
-Use the coding matrix $A = \left[ \begin{array} { l l } 2 & 1 \\ 5 & 3 \end{array} \right]$ and its inverse $A ^ { - 1 } = \left[ \begin{array} { r r } 3 & - 1 \\ - 5 & 2 \end{array} \right]$ to decode the cryptogram $\left[ \begin{array} { r r } 9 & 6 \\ 25 & 17 \end{array} \right]$ .

A) BEAD
B) CARE
C) DARE
D) CURB