if Am*n and Bn*j are matrices then
a) AB=BA
b) AB(NOTEQUAL)BA
c) A=B
d) AB=1 ?? also give full explaination

Question

if Am*n and Bn*j are matrices then 
a) AB=BA
b) AB(NOTEQUAL)BA
c) A=B
d) AB=1 ?? also give full explaination

haseeb96 · Answer

B is the correct answer

anonymous · Answer

how can explain in detail please ??

anonymous · Answer

@Haseeb96

anonymous · Answer

$A_{m, n} *B_{n,j} = C_{m,j}$ we can take product of them since the number of column of matrix A = number of row of matrix B to get a matrix C whose dimension is m x j 
Otherwise, $B_{n,j}*A_{m,n}$ is undefined because of the number of column of first matrix (B) is not = number of row of second matrix (A), 
therefore, A*B $\neq$ B*A|dw:1385217017727:dw|