Let * be a binary operation defined on R by a * b = , then the operation * is
commutative and associative
commutative but not associative
associative but not commutative
neither associative nor commutative
If x, y,z are all different and not equal to zero and = 0, then the value of x-1 + y-1 + z-1 is equal to
xyz
x-1y-1z-1
- x - y - z
- 1
If xy = ex - y, then is equal to
C.
If A is a matrix of order m x n and B is a matrix, such that AB' and B'A are both defined, then the order of the matrix B is
m x m
n x n
n x m
m x n