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81. Relation R defined on a set N by R | (a, b) : |a - bl is divisible by 5 |, is
reflexive
symmetric
transitive
all of these
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82. Given : A = {x, y, z}; B = {u, v, w} The function f : A --> B defined by f(x) = u, f(y) = v, f(z) = w, is
Given : A = {x, y, z}; B = {u, v, w} The function f : A --> B defined by f(x) = u, f(y) = v, f(z) = w, is
surjective
bijective
injective
none of these
83. If A and B are sets, then which of the following is FALSE ?
A - B' = A ∩ B
A ⊂ B ⇒ B' ⊂ A'
A - (A - B) = A ∩ B
None of these
84. If R = ((a, b) l a, b are positive integers such that a - b is on ODD positive integer), then relation R is
equivalence
85. A = (string of 0's and l's). Relation d on A is defined as x dy if x is a sub string of y (Ex. 01 d 101), Then d is
anti symmetric
reflexive and symmetric
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