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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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