CBSE Class 12 Math 2020 Delhi Set 1 Solved Paper

Section-A

Question numbers 1 to 10 are multiple choice questions. Select the correct option :

Question : 1

Total: 36

If A is a square matrix of order 3,such that A(adj‌A)=10I, then |adj‌A| is equal to

Solution: 👈: Video Solution

∵A(adj.A)=|A|I
∴|A|=10
So, |adj.A|=|A|3−1=102=100.

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