If Shiela purchased 11 books for Rs.10 and sold -10 books for Rs. 11, the percentage of profit is :
(1) 21%
(2) 100%
(3) 10%
(4) 11%
The H.C.F of the expressions x2 - 3x2 - 4 and x2 - 4x2 + x is
1) x-1
2) x+1
3) x2-1
4) x2 -3
(1) 20 (2) 100 (3) 120 (4) 480
The system of equations: x+4y-2z=3, 3x+y+5z=7, 2x+3y+z=5 has:
1. a unique solution 2. no solution 3. an infinite number of solution 4. None of these
