CBSE Class 12 Math 2020 Delhi Set 1 Solved Paper

Section-A

Question numbers

\bo {1}

\bo {10}

are multiple choice questions. Select the correct option :

Question : 1 of 36

Marks: +1, -0

{\A}

is a square matrix of order

3, {\such}

that

{\A}({\adj} {\A})=10 {\I}

, then

|{\adj} {\A}|

is equal to

Solution:

∵ {\A}({\adj} . {\A})=| {\A}| {\I}

∴ | {\A}|=10

So,

|{\adj} . {\A}|=| {\A}|^{3-1}=10^2=100

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