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For matrix A = [[2,1],[1,2]], determinant is:

A5
B3
C4
D3 (= 4 - 1)
Answer & Solution
Correct answer: D. 3 (= 4 - 1)
For 2×2 matrix [[a,b],[c,d]]: det = ad - bc. = 4 - 1 = 3.
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