Rank  of  the  matrix 

is 
A.  4 
B.  2 
C.  1 
D.  0 
Option: C Explanation : Click on Discuss to view users comments. 
Inverse of the matrix is
A.  
B.  
C.  
D.  
Option: C Explanation : Click on Discuss to view users comments. 
The system of equations
2x + 4y = 10,
5x + 10y = 25 has
A.  no solution 
B.  only one solution 
C.  only two solutions 
D.  infinite solutions 
Option: D Explanation : Click on Discuss to view users comments. 
For the following set of simulataneous equations:
1.5x  0.5y = 2
4x + 2y + 3z = 9
7x+ y + 5z = 10
A.  solution is unique 
B.  infinitely many solutions exist 
C.  equations are incompatible 
D.  finite number of multiple solutions exists 
Option: A Explanation : By solving the equations, we will get x=178/11 , y=49/11 and z= 237/11. So the answer is 'A Click on Discuss to view users comments. 