JEE AdvancedMathematicsMatrices and DeterminantsMultiple correct+4 / −1
If the ad joint of a 3 3 matrix P is , then the possible value(s) of the determinant of P is(are)
- A2
- B1
- C1
- D2
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Correct answer: A, D
Step-by-step Solution:
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Recall the property of adjoint matrices: For any matrix , the determinant of its adjoint is related to the determinant of the matrix itself by the formula:
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Apply the property to the given matrix P: In this problem, P is a matrix, so . The formula becomes:
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Calculate the determinant of the given adjoint matrix: We are given the adjoint of P as: Let's calculate its determinant:
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Solve for the determinant of P: Substitute the value of into the equation from Step 2: Taking the square root of both sides, we get:
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Conclusion: The possible values for the determinant of P are 2 and -2.
Evaluating the Options:
- A: -2 - This is a possible value.
- B: -1 - This is not a possible value.
- C: 1 - This is not a possible value.
- D: 2 - This is a possible value.
Therefore, the correct options are A and D.
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