Assertion (A) : The function `f:(1,2,3)to(a,b,c,d)` defined by `f={(1,a),(2,b),(3,c)}`.

Assertion (A) : The function `f:(1,2,3)to(a,b,c,d)` defined by `f={(1,a),(2,b),(3,c)}` has no inverse. Reason (R) f is not one-one.