If and
, then
is equal to :
Option: 1
Option: 5
Option: 9
Option: 13
Inverse of a Matrix -
A non-singular square matrix “A” is said to be invertible if there exists a non-singular square matrix B such that AB = I = BA, (all matrix are of the same order, they must be for this), then B is called inverse of matrix A.
Inverse of 2 x 2 matrix
-
Multiplication of two matrices -
Matrix multiplication:
Two matrices A and B are conformable for the product AB if the number of columns in A and the number of rows in B is equal. Otherwise, these two matrices will be non-conformable for matrix multiplication. So on that basis,
i) AB is defined only if col(A) = row(B)
ii) BA is defined only if col(B) = row(A)
If
For examples
-
On comparing we get
Correct Option (2)
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