Question

Which one of the following is a group?
(a) The set (Q - {-1} under the operation
defined by a * b = a + b - ab
(b) The set R under the operation * defined
by a + b = ab + 1
(c) The set Q under the operation * defined
3ab
by a*b =
7.
(d) The set of Z under the operation * defined
by a + b = ab
​

Answer 1

Answer:

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