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MCQ (Single Correct Answer)
GATE CSE 1996
Which one of the following is false?
A) The set of all bijective functions on a finite set forms a group under function composition
B) The set {1,2,…p−1} forms a group under multiplication mod p, where p is a prime number
C) The set of all strings over a finite alphabet forms a group under concatenation
D) A subset S≠∅ of G is a subgroup of the group ⟨G,∗⟩ if and only if for any pair of elements a,b∈S,a∗b−1∈S
