If P={c,d} and U=(a,b,c,d,e}, Find P'

If A = {a, b, c} and B = {b, c, d, e} be two subsets of the universal set U = { a, b, c, d, e} , then ( A cup B) ' is equal to

If U = {a,b,c,d,e,f,g,h} , find the complement of the following sets: A= {a,b,c} , B ={d,e,f,g} , C ={a,c,eg}, D = {f,g,h,a}.

If U=(a, b, c, d, e),A= (a, b, c) and B =(b, c, d, e), then verify (ii) (A n B)' (A' u B') (i) (A u B)' =(A' n B')

If a,b,c, are in A.P., b,c,d are in G.P. and c,d,e, are in H.P., then a,c,e are in

If a,b,c are in H.P , b,c,d are in G.P and c,d,e are in A.P. , then the value of e is

If a,b,c are in H.P,b,c,d are in G.P, and c,d,e are in A.P, then (ab^(2))/((2a-b)^(2)) is equal to

If n be the number of sequence a,b,c,d,e satisfying the conditions (i) a,b,c,d,e are in A.P. and G.P.both,(ii) c=3,7 then n=