Day 388: NDA Maths

1. A.
   $A$
2. B.
   $2|A|I$, where $I$ is the identity matrix
3. C.
   null matrix whose order is same as that of $A$
4. D.
   unit matrix whose order is same as that of $A$

Tap an option to check your answer.

1. A.
   $\dfrac{x}{y}$ is one of the cube roots of unity
2. B.
   $x$ is one of the cube roots of unity
3. C.
   $y$ is one of the cube roots of unity
4. D.
   $\dfrac{x}{y}$ is one of the cube roots of $-1$

Tap an option to check your answer.

1. A.
   $\begin{pmatrix}1&0\\0&1\end{pmatrix}$
2. B.
   $\begin{pmatrix}1&1\\0&0\end{pmatrix}$
3. C.
   $\begin{pmatrix}0&0\\1&1\end{pmatrix}$
4. D.
   $\begin{pmatrix}0&1\\1&0\end{pmatrix}$

Tap an option to check your answer.

1. A.
   $1+x+y+z$
2. B.
   $2xyz$
3. C.
   $x^2y^2z^2$
4. D.
   $2x^2y^2z^2$

Tap an option to check your answer.

1. A.
   $C$ is empty
2. B.
   $B$ has as many elements as $C$
3. C.
   $A = B \cup C$
4. D.
   $B$ has thrice as many elements as $C$

Tap an option to check your answer.