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86. The function f : N --> N deined by f(n) = 2n + 3 is
surjective
not surjective
injective
none of these
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87. The number of distinct relations on a set of 3 elements is
8
9
18
512
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?
Symmetry
Reflexivity
Transitivity
All of these
89. Which of the following relations may be characterized as a function defined on the set I = {1, 2, 3, 4, 5} ?
{ (x, y) I x, y ∈ I, X < Y }
{ (x, y) I x, y ∈ 1, X > Y }
{ (x, y) I x, Y ∈ I, x = y/2}
None of these
90. A - (B ∪ C) is
(A - B) ∪ (A - C)
A - B - C
(A - B) ∩ (A - C)
A - (B ∩ C)'
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