`A=[(0,1,0),(1,0,0),(0,0,1)]`, number of matrices 'B' which can be formed such that `AB=BA` where B can have elements `{1,2,3,4,5}`

Let A = [[0,1,0],[1,0,0],[0,0,1]] . Then the number of 3 xx 3 matrices B with entries from the set {1, 2, 3, 4, 5} and satisfying AB = BA is _______.

Let A=[(2,3),(5,7)] and B=[(a, 0), (0, b)] where a, b in N . The number of matrices B such that AB=BA , is equal to

No.of different matrices that can be formed with elements 0,1,2 or 3 each matrix having 4 elements is

If A=[(2,1,3),(4,1,0)] and B=[(1,-1),(0,2),(5,0)] , then AB will be

A=[(-1,3,0),(-7,2,8)],B=[(-5,0),(0,3),(1,-8)] . then AB

How many diagonal matrices of order 3 can be formed using the elements 1,0,-1 only

Let A=[(2,0,7),(0,1,0),(1,-2,1)] and B=[(-k,14k,7k),(0,1,0),(k,-4k,-2k)] . If AB=I , where I is an identity matrix of order 3, then the sum of all elements of matrix B is equal to