alleryA square matrix is invertible if and only if it is:
ASingular one
BRectangular a
CDiagonal one
DNon-singular
Answer & Solution
Correct answer: D. Non-singular
1. An inverse exists only when the determinant is non-zero.
2. That is exactly the non-singular condition.
3. So a matrix is invertible if and only if it is non-singular.
4. The answer is non-singular.
_Source: syllabus Mathematics, Ch 4 'Determinants'_
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