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Reported Question / Answer
Q.) The set of integers Z with the binary operation \"*\" defined as a*b =a b 1 for a, b ∈ Z, is a group. The identity element of this group is
1)
1
2)
0
3)
12
4)
-1
5)
NULL
Answer :
4
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Human Verification : Answer 2 + 3 = ?
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