alleryA matrix has $3$ rows and $4$ columns. Its order is:
A$4 \times 3$
B$3 \times 4$
C$12$
D$7$
Answer & Solution
Correct answer: B. $3 \times 4$
Convention: the order of a matrix is written as **rows × columns**. A matrix with 3 rows and 4 columns has order $3 \times 4$.
Don't confuse with the total number of elements
(12) or the sum of dimensions (7). Matrix multiplication compatibility depends on order: an $m \times n$ matrix can multiply an $n \times p$ matrix.
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