1 point let s be a set and p(s) be the power set of s. then {p(s), u} 1s not a group because a. p(s) 1s not closed w.r.to u. b.u 1s not associative. c. 1nverse

1 point Let S be a set and P(S) be the power Set of S. Then {P(S), U} 1s not a group because A. P(S) 1s not closed w.r.to U. B.U 1s not associative. C. 1nverse does not cxIst. D. the identity clement does not exist. OA OB Oc O D 1 point Every automorphism f of the rational numbers Q under addition to itself has the form (a) f(x)-xf(1) (b) fx)=xf) () f(x)-xf(1) or -xf() (d) None of these OA OB OC O D