161. In PERT the span of time between the optimistic and pessismistic time estimates of an activity is ______________
162. In a set – builder method, the null set is represented by
163. In a survey conducted in Patna, it was found that 3/4ths of town owns color T.V., 85 % of the people own refrigerators and every 4 in 5 in the town own music systems, what is the minimum percentage of people who have all the three?
164. The range of the function f(x) = |x - 1| is
165. Find the domain of the function y = f(x) which is defined as f(x) = (1 / √{x- [x]}) [x] is the greatest integer function
166. Let f = {(x, x2 /1+x2 ): x € R } be a function from R into R . range of x is
167. A relation R ={(1,1), (1,2)}ON a ={1,2,3}. A minimum number of elements required in R so that the enlarged relation becomes an equilance relationis
168. Find the sum of 17 terms of the A.P. 5, 9, 13, 17, …
169. 55 cows can graze a field in 16 days. How many cows will graze the same field in 10 days?
170. Log 36 / log 6