Find the Order of Matrix AB

Given:

\[ A \text{ is of order } 3 \times 4,\quad B \text{ is of order } 4 \times 3 \]

Step 1: Check Multiplication Condition

\[ \text{Number of columns of A} = \text{Number of rows of B} = 4 \]

So, AB exists.

Step 2: Determine Order

\[ AB \text{ will be of order } 3 \times 3 \]

Final Answer:

\[ \boxed{3 \times 3} \]