Question

Check whether following sets with respective binary operation forms a group or not 1. (N,+)
2. ( Z, •)​

Answer 1

Answer:

(c) - 1

Step-by-step explanation:

a*b =a+b+1((a,b,z is a group)

at b=-1 =a*b =a-1+1=a

=a*0=a+0+1

=identity element is - 1