191. The equation 6x + y =7 will have a solution if
3x + y =4
-6x -2y = a
192. If R is a relation from a finite set A having m elements to a finite set B having n elements, then the number of relations from A to B is
193. Solve x +2y +3z = 85
3x +2y +2z = 105
2x +3y +2z = 110
194. Solve 2x –y -2z =0
x +2y -3z =9
3x –y -4z = 3
195. Solve x +2y –z =2 by finding inverse of the coefficient matrix
3x -4y +2z =1
-x +3y –z = 4
196. Are
1) 2x +4y -z = 5
2) y +z = 2
3) x + y +z = 7
197. If the set has p elements, b has q elements, the no of elements in A x B is
198. Let f(x) = x / x+ 3, then f (x + 1) =
199. If b = f(a) and f(a) = (a – 1) / (a + 1), which of the following is true?
200. If A = {1, 2, 3}, B = {1,4,6, 9} and R is a relation from A to B defined by x is greater than y. The range of R is