1
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If A is an identity matrix of order 3, then its inverse (A$$-$$1)
A
is equal to null matrix
B
is equal to A
C
is equal to 3A
D
does not exist
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
A is a square matrix of order 3 such that its determinant is 4. What is the determinant of its transpose?
A
64
B
36
C
32
D
4
3
NDA Mathematics 21 April 2024
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Let $A$ and $B$ be matrices of order $3 \times 3$. If $|A| = \frac{1}{2 \sqrt{2}}$ and $|B| = \frac{1}{729}$, then what is the value of $|2B(adj(3A))|$?

A

27

B

$\frac{-27}{2\sqrt{2}}$

C

$\frac{27}{2}$

D

1

4
NDA Mathematics 21 April 2024
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following statements in respect of two non-singular matrices $A$ and $B$ of the same order $n$:

  1. 1.$adj(AB) = (adjA)(adjB)$

  2. 2. $adj(AB) = adj(BA)$

  3. 3. $(AB) adj(AB) - |AB| I_n$ is a null matrix of order $n$

How many of the above statements are correct?
A

None

B

Only one statement

C

Only two statements

D

All three statements

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