1
GATE CSE 2005
+2
-0.6
Consider the following system of equations in three real variables $$x1, x2$$ and $$x3$$ :
$$2x1 - x2 + 3x3 = 1$$
$$3x1 + 2x2 + 5x3 = 2$$
$$- x1 + 4x2 + x3 = 3$$
This system of equations has
A
no solution
B
a unique solution
C
more than one but a finite number of solutions
D
an infinite number of solutions
2
GATE CSE 2004
+2
-0.6
How many solutions does the following system of linear equations have?

- x + 5y = - 1
x - y = 2
x + 3y = 3
A
infinitely many
B
two distinct solutions
C
unique
D
None
3
GATE CSE 2004
+2
-0.6
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, such that no two are on the same row or column, is
A
$$\le a + b$$
B
$$\le \max \left\{ {a,\,b} \right\}$$
C
$$\le$$ $$\min \left\{ {M - a,\,N - b} \right\}$$
D
$$\le \min \left\{ {a,\,b} \right\}$$
4
GATE CSE 2004
+2
-0.6
If matrix $$X = \left[ {\matrix{ a & 1 \cr { - {a^2} + a - 1} & {1 - a} \cr } } \right]$$
and $${X^2} - X + 1 = 0$$
($${\rm I}$$ is the identity matrix and $$O$$ is the zero matrix), then the inverse of $$X$$ is
A
$$\left[ {\matrix{ {1 - a} & { - 1} \cr {{a^2}} & a \cr } } \right]$$
B
$$\left[ {\matrix{ {1 - a} & { - 1} \cr {{a^2} - a + 1} & a \cr } } \right]$$
C
$$\left[ {\matrix{ { - a} & 1 \cr { - {a^2} + a - 1} & {a - 1} \cr } } \right]$$
D
$$\left[ {\matrix{ {{a^2} - a + 1} & a \cr 1 & {1 - a} \cr } } \right]$$
GATE CSE Subjects
Theory of Computation
Operating Systems
Algorithms
Digital Logic
Database Management System
Data Structures
Computer Networks
Software Engineering
Compiler Design
Web Technologies
General Aptitude
Discrete Mathematics
Programming Languages
Computer Organization
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