261. For which value of c are the lines parallel 2x – y=10
-cx + 2y =5
262. A set consisting of a definite number of elements is called a
263. In a club, all the members are free to vote for one, two, or three of the candidates. 20 % of the members did not vote, 38 % of the total members voted for at least 2 candidates. What % of the members voted for either 1 or 3 candidates, If 10 % of the total members voted for all 3 candidates?
264. The range of the function f(X) = x / |x| is
265. If f(x) = - then the value of 2(f(x))- 5f(x-1) + 2f(x-2) is
266. f(x) = |x|+ |y| g(x) = max (x + y) (x – y) h(x) = min (x + y, x – y)
(i) g(x) f(x)
(ii) g(x) + h(x) f(x)
(iii) g(x) > f(x).
Which of the following are not necessarily true?
267. Solve f(x) = √9-x2 the range is
268. If R is the relation “is greater than” from A ={1,2,3,4,5}to B={1,3,4} , Than R-1 is
269. Find the sum of the series 2+5+8+ … +182
270. If x and y vary inversely as each other, x = 10 when y = 6. Find y when x=15.