alleryIf A = [[1,2],[3,4]], find det(A):
A-2
B2
C8
D10
Answer & Solution
Correct answer: A. -2
For 2×2: det = a_11 × a_22 - a_12 × a_21 = 1·4 - 2·3 = 4 - 6 = -2.
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