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

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