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Question

If A=25215241063586162620, then the determinant of the matrix adj(2A) is equal to:

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Solution

A=∣ ∣25215241063586162620∣ ∣=0
We know that,

adj(A)=(A)n1
and, 2A=2nA

adj(2A)=(2)3(A)2=0

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