81
In applying one or more row operations while finding $A^{-1}$ by elementary row operations, we obtain all zeroes in one or more, then $A^{-1} \ldots \ldots .$.
Explanation
In applying one or more row operations while finding $A^{-1}$ by elementary row operations, we obtain all zeroes in one or more, then $A^{-1}$ does not exist.
82
A matrix denotes a number.
A
TRUE
B
FALSE
83
Matrices of any order can be added.
A
TRUE
B
FALSE
84
Two matrices are equal, if they have same number of rows and same number of columns.
A
TRUE
B
FALSE
85
Matrices of different order cannot be subtracted.
A
TRUE
B
FALSE