Discrete Maths - Sets

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

A
B
C
D

Answer
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Option : C
Explanation :

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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 ?

Answer
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Option : A
Explanation :

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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,……}

Answer
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Array

Option : C
Explanation :

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

Answer
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Option : B
Explanation :

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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 ?

Answer
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Option : A
Explanation :

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