Note:(1) Minimum number of zeros in an upper or lower triangular matrix of ordernn(n-1)= 1+2+3+......... + (n -1)= -2Minimum number of cyphers in a diagonal/scalar/unit matrix of order n=n(n-1)and maximum number of cyphers=n²-1.It is to be noted that with every square matrix there is a corresponding determinant formed by theelements of A in the same order. If|Al=0 then A is called a singular matrix and if|A| =0 then a iscalled a non singular matrix.To 01Note: IfA= o then det. A=0 but not conversely.