Answer:
Fourth option
Step-by-step explanation:
An m×n matrix is a matrix with m rows (horizontal lines) and n columns (vertical lines).
By definition, the multiplication of two matrices [tex]m_1[/tex]×[tex]n_1[/tex] and [tex]m_2[/tex]×[tex]n_2[/tex] can be done only if:
[tex]n_1 = m_2[/tex]
In the first option:
[tex]n_1 = 2\\m_2 = 1[/tex]
In the second option
[tex]n_1 = 1\\m_2 = 2[/tex]
In the third option
[tex]n_1 = 2\\m_2 = 1[/tex]
In the fourth option
[tex]n_1 = 1\\m_2 = 1[/tex]
[tex]n_1 = m_2[/tex] Multiplication can be done
