If `A={a,b},B={c,d},C={d,e}`, then `{(a,c),(a,d),(a,e),(b,c),(b,d),(b,e)}` is equal to

(a)If A=[a,b],B=[c,d],C=[d,e] then {(a,c),(a,d),(a,e),(b,c),(b,d),(b,e)}=………

If a,b,c,d,e are in H.P., then a/(b+c+d+e), b/(a+c+d+e),c/(a+b+d+e), d/(a+b+c+e), e/(a+b+c+d) are in (A) A.P. (B) G.P. (C) H.P. (D) none of these

If a,b,c,d,e are in H.P., then a/(b+c+d+e), b/(a+c+d+e),c/(a+b+d+e), d/(a+b+c+e), e/(a+b+c+d) are in (A) A.P. (B) G.P. (C) H.P. (D) none of these

If A= {a, b, c, d} andB = {b, c, e} , then A cup B is equal to

If A = {a, b, c, d, e} B= {c, d, e, f}, C = {b, d}, D = {a, e} then which of the follwing statements are true and which are false : C sube B

If a,b,c,d are four positive numbers that (i)((a)/(b)+(b)/(c))((c)/(d)+(d)/(e)) =4.sqrt((a)/(c))(iii)(a)/(b)+(b)/(c)+(c)/(d)+(d)/(e)+(e)/(a) =(1)/(5)

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 a,b,c,d are four positive numbers then (A) ((a)/(b)+(b)/(c))((c)/(d)+(d)/(c)) =4.sqrt((a)/(c))(C)(a)/(b)+(b)/(c)+(c)/(d)+(d)/(e)+(e)/(a) =(1)/(5)