Class XII If A and B are two matrices such that A + B and AB are both defined, then number of columns of A = number of ros of B. A, B are square matrices not necessarily of same order A, B are square matrices of same order A and B can be any matrices Two matrices A and B are multiplicative inverse of each other only if AB = BA = I AB = O, BA = I AB = BA AB = BA = O The system of equations, x + 2y = 5 ,4x + 8y = 20 has infinitely many solutions a unique solution none of these. no solution A square matrix A=[aij]n×n is called an upper triangular if aij=0 for i is greater than j i = j none of these i is less than j The system of equations x + 2y = 11,-2 x – 4y = 22 has no solution only one solution infinitely many solutions. finitely many solution Do you really want to submit this quiz? Cancel Submit Quiz