In a compact one-dimensional array representation for lower triangular matrix (all elements above diagonal are zero) of size n × n, non zero elements of each row are stored one after another, starting from first row, the index of (i, j)th element in this new representation is

In a compact one-dimensional array representation for lower triangular

1.	In a compact one-dimensional array representation for lower triangular matrix (all elements above diagonal are zero) of size n × n, non zero elements of each row are stored one after another, starting from first row, the index of (i, j)th element in this new representation is
A.	\(i + j\)
B.	\(j+i(i-1)/2\)
C.	\(i + j – 1\)
D.	\(i+j(j-1)/2\)
Answer» C. \(i + j – 1\)