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Question

If the adjoint of a 3×3 matrix A is 144217113, then the possible value(s) of the determinant of A is(are)

A
2
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B
1
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C
1
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D
2
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Solution

The correct option is D 2
Let A=[aij]3×3

adj A=144217113

|adjA|=1(37)4(67)+4(21)=4

|A|31=4

|A|2=4

|A|=±2

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