Discrete Maths - Sets

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86. The function f : N --> N deined by f(n) = 2n + 3 is

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Option : C
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87. The number of distinct relations on a set of 3 elements is

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Option : D
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88. If relation R over {a, b, c} is given by R = {(a, a), (a, b), (b, a), (b, b), (c, c)}, then which of the following properties does R have?

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Option : D
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89. Which of the following relations may be characterized as a function defined on the set I = {1, 2, 3, 4, 5} ?

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Option : D
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90. A - (B ∪ C) is

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Option : C
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