EC > GATE 2026 > Linear Algebra
Consider the matrix M = [2 1 1; 1 3 0; −1 a b].
Which of the following options is/are TRUE if det(M) ≠ 0?
A
a = −1/2 and b = −1/2
B
a = 1/2 and b = 1/2
C
a = −3 and b = 0
D
a = 1/2 and b = −3

Correct :

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