Answer :

Given matrix orders


[A] with 3 x 4 and [B] with 4 x 3


We have to find the order of [B].[A]


For matrix multiplication the columns of 1st matrix and the rows of 2nd matrix should be equal.


E.g. [A]3x2.[B]2x2


The order of new matrix formed after multiplication of matrices will be 1st matrix row will be taken as new matrix rows. The no. of columns in 2nd matrix will be taken as new matrix columns.


E.g. [A]3x2.[B]2x2 = [AB]3x2


In the same way [B]4x3.[A]3x4 = [AB]4x4


option (B) is correct answer

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