## Marks 1

Let $$A = \left[ {\matrix{
1 & 2 & 3 & 4 \cr
4 & 1 & 2 & 3 \cr
3 & 4 & 1 & 2 \cr
2 & 3 & 4 & 1 \cr
} } \right]$$ and $$B = \left...

Consider the following two statements with respect to the matrices Am $$\times$$ n , Bn $$\times$$ m , Cn$$\times$$ n and Dn $$\times$$ n .
Statement...

Which one of the following is the closed form for the generating function of the sequence (an}n $$\ge$$ 0 defined below?
$${a_n} = \left\{ {\matrix{
...

Consider solving the following system of simultaneous equations using LU decomposition.
x1 + x2 $$-$$ 2x3 = 4
x1 + 3x2 $$-$$ x3 = 7
2x1 + x2 $$-$$ 5x3...

Which of the following is/are the eigen vector(s) for the matrix given below?
$$\left( {\matrix{
{ - 9} & { - 6} & { - 2} & { - 4} \cr
{ - 8} ...

Let X be a square matrix. Consider the following two statements on X.
I. X is invertible.
II. Determinant of X is non-zero.
Which one of the followin...

Consider a matrix $$A = u{v^T}$$ where $$u = \left( {\matrix{
1 \cr
2 \cr
} } \right),v = \left( {\matrix{
1 \cr
1 \cr
} } \ri...

Let $${c_1},.....,\,\,{c_n}$$ be scalars, not all zero, such that $$\sum\limits_{i = 1}^n {{c_i}{a_i} = 0} $$ where $${{a_i}}$$ are column vectors in ...

Let $$P = \left[ {\matrix{
1 & 1 & { - 1} \cr
2 & { - 3} & 4 \cr
3 & { - 2} & 3 \cr
} } \right]$$ and $$Q = \...

Suppose that the eigen values of matrix $$A$$ are $$1, 2, 4.$$ The determinant of $${\left( {{A^{ - 1}}} \right)^T}$$ is _______.

Consider the system, each consisting of m linear equations in $$n$$ variables.
$$I.$$ $$\,\,\,$$ If $$m < n,$$ then all such system have a solutio...

Two eigenvalues of a $$3 \times 3$$ real matrix $$P$$ are $$\left( {2 + \sqrt { - 1} } \right)$$ and $$3.$$ The determinant of $$P$$ is _______.

Let $${a_n}$$ be the number of $$n$$-bit strings that do NOT contain two consecutive $$1s.$$ Which one of the following is the recurrence relation for...

In the LU decomposition of the matrix $$\left[ {\matrix{
2 & 2 \cr
4 & 9 \cr
} } \right]$$, if the diagonal elements of U are both...

The larger of the two eigenvalues of the matrix $$\left[ {\matrix{
4 & 5 \cr
2 & 1 \cr
} } \right]$$ is ______.

The number of divisors of $$2100$$ is ___________.

In the given matrix $$\left[ {\matrix{
1 & { - 1} & 2 \cr
0 & 1 & 0 \cr
1 & 2 & 1 \cr
} } \right],$$ one of t...

The value of the dot product of the eigenvectors corresponding to any pair of different eigen values of a 4-by-4 symmetric positive definite matrix is...

Consider the following system of equations:
3x + 2y = 1
4x + 7z = 1
x + y + z =3
x - 2y + 7z = 0
The number of solutions for this system is _____...

Which one of the following statements is TRUE about every $$n\,\, \times \,n$$ matrix with only real eigen values?

If $${V_1}$$ and $${V_2}$$ are 4-dimensional subspaces of a 6-dimensional vector space V, then the smallest possible dimension of $${V_1}\, \cap \,\,{...

If the matrix A is such that
$$$A = \left[ {\matrix{
2 \cr
{ - 4} \cr
7 \cr
} } \right]\,\,\left[ {\matrix{
1 & 9 & 5 \c...

Which of the following does not equal
$$\left| {\matrix{
1 & x & {{x^2}} \cr
1 & y & {{y^2}} \cr
1 & z & {{z^2}}...

Let $$A$$ be the $$2 \times 2$$ matrix with elements $${a_{11}} = {a_{12}} = {a_{21}} = + 1$$ and $${a_{22}} = - 1$$. Then the eigen values of the m...

Consider the following matrix $$A = \left[ {\matrix{
2 & 3 \cr
x & y \cr
} } \right].$$
If the eigen values of $$A$$ are $$4$$ an...

The following system of equations
$${x_1}\, + \,{x_2}\, + 2{x_3}\, = 1$$
$${x_1}\, + \,2 {x_2}\, + 3{x_3}\, = 2$$
$${x_1}\, + \,4{x_2}\, + a{x_3}\,...

Let $$A$$ be the matrix $$\left[ {\matrix{
3 & 1 \cr
1 & 2 \cr
} } \right]$$. What is the maximum value of $${x^T}Ax$$ where the ...

The determination of the matrix given below is $$$\left[ {\matrix{
0 & 1 & 0 & 2 \cr
{ - 1} & 1 & 1 & 3 \cr
0 &am...

Let A, B, C, D be $$n\,\, \times \,\,n$$ matrices, each with non-zero determination. If ABCD = I, then $${B^{ - 1}}$$ is

What values of x, y and z satisfy the following system of linear equations?
$$$\left[ {\matrix{
1 & 2 & 3 \cr
1 & 3 & 4 \cr
...

The number of different $$n \times n$$ symmetric matrices with each elements being either $$0$$ or $$1$$ is

$$A$$ system of equations represented by $$AX=0$$ where $$X$$ is a column vector of unknown and $$A$$ is a square matrix containing coefficients has a...

The rank of the matrix$$\left[ {\matrix{
1 & 1 \cr
0 & 0 \cr
} } \right]\,\,is$$

Consider the following statements:
S1: The sum of two singular n x n matrices may be non-singular
S2: The sum of two n x n non-singular matrices may...

The determinant of the matrix
$$$\left[ {\matrix{
2 & 0 & 0 & 0 \cr
8 & 1 & 7 & 2 \cr
2 & 0 & 2 & 0 ...

An $$n\,\, \times \,\,n$$ array v is defined as follows v[i, j] = i - j for all i, j, $$1\,\, \le \,\,i\,\, \le \,\,n,\,1\,\, \le \,\,j\,\, \le \,\,n$...

Consider the following set a equations
x + 2y = 5
4x + 8y = 12
3x + 6y + 3z = 15 This set

The determination of the matrix
$$$\left[ {\matrix{
6 & { - 8} & 1 & 1 \cr
0 & 2 & 4 & 6 \cr
0 & 0 & 4 &a...

Let AX = B be a system of linear equations where A is an m x n matrix and B is a $$m\,\, \times \,\,1$$ column vector and X is a n x 1 column vector o...

Let $$A = \left[ {\matrix{
{{a_{11}}} & {{a_{12}}} \cr
{{a_{21}}} & {{a_{22}}} \cr
} } \right]\,\,$$ and $$B = \left[ {\matrix{
...

The rank of the following (n + 1) x (n + 1) matrix, where a is a real number is
$$$\left[ {\matrix{
1 & a & {{a^2}} & . & . & ...

The rank of the following (n + 1) x (n + 1) matrix, where a is a real number is
$$$\left[ {\matrix{
1 & a & {{a^2}} & . & . & ...

The inverse of the matrix $$\left[ {\matrix{
1 & 0 & 1 \cr
{ - 1} & 1 & 1 \cr
0 & 1 & 0 \cr
} } \right]$$ is

The rank of the matrix $$\left[ {\matrix{
0 & 0 & { - 3} \cr
9 & 3 & 5 \cr
3 & 1 & 1 \cr
} } \right]$$ is

If $$A = \left[ {\matrix{
1 & 0 & 0 & 1 \cr
0 & { - 1} & 0 & { - 1} \cr
0 & 0 & i & i \cr
0 &...

The eigen vector (s) of the matrix
$$\left[ {\matrix{
0 & 0 & \alpha \cr
0 & 0 & 0 \cr
0 & 0 & 0 \cr
} } \r...

## Marks 2

Consider the following matrix.
$$\left( {\begin{array}{*{20}{c}} 0&1&1&1\\ 1&0&1&1\\ 1&1&0&1\\ 1&1&1&...

Let A and B be two n$$ \times $$n matrices over real numbers. Let rank(M) and det(M) denote the rank and determinant of a matrix M, respectively. Cons...

Which one of the following is a closed form expression for the generating function of the sequence $$\left\{ {{a_n}} \right\},$$ where $${a_n} = 2n + ...

Consider a matrix P whose only eigenvectors are the multiples of $$\left[ {\matrix{
1 \cr
4 \cr
} } \right].$$
Consider the following sta...

Let $$A$$ be $$n\,\, \times \,\,n$$ real valued square symmetric matrix of rank $$2$$ with $$\sum\limits_{i = 1}^n {\sum\limits_{j = 1}^n {A_{ij}^2 = ...

If the characteristic polynomial of a $$3 \times 3$$ matrix $$M$$ over $$R$$(the set of real numbers) is $${\lambda ^3} - 4{\lambda ^2} + a\lambda + ...

Let $${A_1},\,{A_2},\,{A_3}$$ and $${A_4}$$ be four matrices of dimensions $$10 \times 5,\,5 \times 20,\,20 \times 10,$$ and $$10 \times 5,$$ respecti...

The value of the expression $${13^{99}}$$ ($$mod$$ $$17$$), in the range $$0$$ to $$16,$$ is ______________ .

Consider the recurrence relation
$${a_1} = 8,\,{a_n} = 6{n^2} + 2n + {a_{n - 1}}.$$ Let $${a_{99}} = K \times {10^4}.$$ The value of $$K$$ is _______...

Consider the following $$2 \times 2$$ matrix $$A$$ where two elements are unknown and are marked by $$a$$ and $$b.$$ The eigenvalues of this matrix a...

$$\sum\limits_{x = 1}^{99} {{1 \over {x\left( {x + 1} \right)}}} $$ = _____________.

Let $${a_n}$$ represent the number of bit strings of length n containing two consecutive 1s. What is the recurrence relation for $${a_n}$$?

Perform the following operations on the matrix $$\left[ {\matrix{
3 & 4 & {45} \cr
7 & 9 & {105} \cr
{13} & 2 & {...

If the following system has non - trivial solution
$$$px+qy+rz=0$$$
$$$qx+ry+pz=0$$$
$$$rx+py+qz=0$$$
Then which one of the following Options is TRUE...

The product of the non-zero eigenvalues of
the matrix $$\left[ {\matrix{
1 & 0 & 0 & 0 & 1 \cr
0 & 1 & 1 & 1 &...

Four matrices $${M_1},\,\,\,{M_2},\,\,\,{M_3}$$ and $${M_4}$$ of dimensions $$p\,\,x\,\,q,\,\,\,\,\,q\,\,x\,\,e,\,\,\,\,\,r\,\,x\,\,s$$ and $$\,\,\,\,...

Consider the matrix as given below.
$$$\left[ {\matrix{
1 & 2 & 3 \cr
0 & 4 & 7 \cr
0 & 0 & 3 \cr
} } \right...

$$\left[ A \right]$$ is a square matrix which is neither symmetric nor skew-symmetric and $${\left[ A \right]^T}$$ is its transpose. The sum and diffe...

Consider the following matrix $$A = \left[ {\matrix{
2 & 3 \cr
x & y \cr
} } \right]\,\,$$ If the eigen values of $$A$$ are $$4$$ ...

How many of the following matrices have an eigen value $$1$$?
$$\left[ {\matrix{
1 & 0 \cr
0 & 0 \cr
} } \right],\,\,\left[ {\matr...

If $$M$$ is a square matrix with a zero determinant, which of the following assertion(s) is (are) correct?
$$S1$$ : Each row of $$M$$ can be represen...

Let $$A$$ be $$a$$ $$4$$ $$x$$ $$4$$ matrix with eigen values $$-5$$, $$-2, 1, 4$$.
Which of the following is an eigen value of $$\left[ {\matrix{
...

$$F$$ is an $$n$$ $$x$$ $$n$$ real matrix. $$b$$ is an $$n$$ $$x$$ $$1$$ real vector. Suppose there are two $$n$$ $$x$$ $$1$$ vectors, $$u$$ and $$v$$...

What are the eigen values of the matrix $$P$$ given below?
$$$P = \left( {\matrix{
a & 1 & 0 \cr
1 & a & 1 \cr
0 & 1 ...

What are the eigen values of the following $$2x2$$ matrix?
$$$\left[ {\matrix{
2 & { - 1} \cr
{ - 4} & 5 \cr
} } \right]$$$

Consider the set $$H$$ of all $$3$$ $$X$$ $$3$$ matrices of the type
$$$\left[ {\matrix{
a & f & e \cr
0 & b & d \cr
0 &a...

Consider the following system of equations in three real variables $$x1, x2$$ and $$x3$$ :
$$2x1 - x2 + 3x3 = 1$$
$$3x1 + 2x2 + 5x3 = 2$$
$$ - x1 + 4x...

How many solutions does the following system of linear equations have?
- x + 5y = - 1x - y = 2x + 3y = 3

In an M$$ \times $$N matrix such that all non-zero entries are covered in $$a$$ rows and $$b$$ columns. Then the maximum number of non-zero entries, s...

If matrix $$X = \left[ {\matrix{
a & 1 \cr
{ - {a^2} + a - 1} & {1 - a} \cr
} } \right]$$
and $${X^2} - X + 1 = 0$$
($${\rm I}$$ ...

Let $$A$$ be and n$$ \times $$n matrix of the folowing form.
What is the value of the determinant of $$A$$?...

Consider the following system of linear equations
$$$\left[ {\matrix{
2 & 1 & { - 4} \cr
4 & 3 & { - 12} \cr
1 & 2 &...

Obtain the eigen values of the matrix
$$$A = \left[ {\matrix{
1 & 2 & {34} & {49} \cr
0 & 2 & {43} & {94} \cr
0 &...

The rank of the matrix given below is:
$$$\left[ {\matrix{
1 & 4 & 8 & 7 \cr
0 & 0 & 3 & 0 \cr
4 & 2 & 3 ...

Consider the following determinant
$$$\Delta = \left| {\matrix{
1 & a & {bc} \cr
1 & a & {ca} \cr
1 & a & {ab} ...

Let $$A = ({a_{ij}})$$ be and n-rowed square matrix and $${I_{12}}$$ be the matrix obtained by interchanging the first and second rows of the n-rowed ...

The matrices$$\left[ {\matrix{
{\cos \,\theta } & { - \sin \,\theta } \cr
{\sin \,\,\theta } & {\cos \,\,\theta } \cr
} } \right]\...

If A and B are real symmetric matrices of size n x n. Then, which one of the following is true?

In a compact single dimensional array representation for lower triangular matrices (i.e., all the elements above the diagonal are zero) of size $$n$$ ...

A square matrix is singular whenever:

If a, b and c are constants, which of the following is a linear inequality?