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A matrix "a" is called lower triangular if and only if for all j > ai j = 0. If such a matrix is to be sorted in a one dimensional array, A then ai j could be mapped to which of the following index of | |
A. | i + j [Wrong Answer] |
B. | i (i + 1) + j [Wrong Answer] |
C. | 1/2 * i (i + 1) j [Correct Answer] |
D. | none of these [Wrong Answer] |