" 7.If "(123)B=(3" 4) then order of the matrix "B" is "

If (123)B=(34) then order of the matrix B is

If [(1,2,3)]B=[(3,4)] then the order of the matrix B is

If [(1,2,3)]B=[(3,4)] then the order of the matrix B is

If [[1,2,3]].B=(3,4) , then the oredr of the matrix is

The order of the matrix [{:(1,2,3),(4,5,6):}] is

The order of the matrix A is 3xx5 and that of B is 2xx3 . The order of the matrix BA is

If A is matrix of order m xx n and B is a matrix such that AB' and B'A are both defined, the order of the matrix B is