The complex conjucate of 2+i is
(a) -2+i
(b) -2-
(c) 2-i
(d) 2+i
(1) The Order of the matrix [1 2 5 7] is
(1) 1 x 4
(2) 4 x 1
(3) 2 x 1
(4) 1 x 1
(2) Number of elements in a matrix or order 2 x 3 is
(1) 5
(2) 2
(3) 3
(4) 6
(3) if A =