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131. f : R → R is a function defined by f(x) = 10x - 7.If g =f-¹, then g(x) =

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132. Assume R and S are (non empty) relations in a set A. Which of the following given relations is FALSE ?

If R and S are transitive, then R ∪ S is transitive

If R and S are transitive, then R ∩ S is transitive

If R and S are symmetric, then R ∪ S is symmetric

If R and S are reflexive, then R ∪ S is reflexive

133. With respect to the relation 'x divides y', which of the following sets are totally ordered ?I. {36, 3, 9}II. {7, 77, 11}III. {3,6, 24,12}IV. {1, 2, 3,……}

I, II and III only

II and III only

I and III only

All of these

134. To have inverse for the function f, f is

one one

onto

one one onto

identity function

135. In a group of 72 students, 47 have background is Electronics, 59 have background in Mathematics and 42 have background in both the subjects. How many students do not have background in any of the, subjects ?

8

13

25

34

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