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Question

If A is 6×6 matrix and ||A|adj(|A|A)|=|A|n, then n is

A
40
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B
31
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C
25
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D
41
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Solution

The correct option is D 41
||A|adj(|A|A)|=|A|6|adj(|A|A)|
=|A|6×||A|A|5
=|A|6×(|A|6|A|)5
=|A|6×|A|35
=|A|41
So n = 41

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