1. The number of all one-one
functions from set A = {1, 2, 3} to itself is
(a) 2
(b) 6 (c) 3 (d) 1
Ans b
2. A relation R from A to B is an arbitrary
subset of
(a) A
× B (b) B ×
A (c) A × A (d) B ×
B
Ans b
3. A relation R in a set A is said to be an equivalence
relation, if R is
(a) symmetric
only (b) reflexive only
(c) transitive
only (d) All of these
Ans d
4. A1 coincides with the set of
all integers in Z which are related to ...A..., A2 coincides with the set of all integers
which are related to ...B... and
A3 coincides with the set of all integers in Z which are related to ...C... . Here, A, B and C are
respectively
(a) one,
zero, two (b) zero, one, two
(c) two,
one, zero (d) one, two, zero
Ans b
Ans d
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