alleryMatch lower diag: 1. Lower: p. Above 0 2. Tri: q. Half shape 3. Diag: r. Mid line
A1-p, 2-q, 3-r
B1-p, 2-r, 3-q
C1-q, 2-p, 3-r
D1-r, 2-p, 3-q
Answer & Solution
Correct answer: A. 1-p, 2-q, 3-r
In a lower triangular matrix, all values above the main diagonal are zero, forming a lower triangular block of active entries.
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