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JEE PYQ: Matrices And Determinants Question 28

Question 28 - 2021 (26 Feb Shift 1)

Let $A$ be a symmetric matrix of order $2$ with integer entries. If the sum of the diagonal elements of $A^2$ is $1$, then the possible number of such matrices is:

(1) $6$

(2) $1$

(3) $4$

(4) $12$

Show Answer

Answer: (3)


Learning Progress: Step 28 of 89 in this series