(1) Let Nn = {1, 2, · · · , n} for a positive integer n then, f : Nn → Nn is a permutation if
(a) f is one one but not onto.
(b) f is one one and onto.
(c) f is onto but not one one.
(d) f is any function.
(2) What is the number of even permutations in S3?
(a) 3 (b) 4 (c) 0 (d) 6
Answer:
Option a), 3
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