Question
Mathematics Question on Matrices
Let M be 2 × 2 symmetric matrix with integer entries, then M is invertible if
A
the first column of M is the transpose of second row of M
B
the second row of M is the transpose of first column of M
C
M is diagonal matrix with non-zero entries in the principal diagonal
D
The product of entries in the principal diagonal of M is the product of entries in the other diagonal
Answer
M is diagonal matrix with non-zero entries in the principal diagonal
Explanation
Solution
The correct answer is () :