Question

Decide whether the system is a group. If it is not a group, identify which of the following properties it fails to satisfy: closure, associativity, identity, inverse. (-2, -1, 0, 1, 2); addition

Answer 1

fail closure. 1+2 isn't in the set

Answer 2

So is the answer
a. not a group; closure, identity, inverse
b. not a group; closure
c. group
d. not a group; associative, inverse

Thank you!!

Answer 3

B