Question

In which of the following cases, given * is a Binary operation on the set S?
(A) S={1,2,3,6,18}, a*b=ab
(B) S= {1,-2,3,2,-4}, a*b=|b|
(C) S=Z,a*b=a+b²
(P) S=N ,a*b=a-b​

Answer 1

Answer:

hard

Step-by-step explanation:

but not impossible

best of luck