" If "a,b,c,d" are in H.P.then "ab+bc+cd=

If a,b,c ,d are in H.P., then show that ab + bc + cd =3ad

If a,b,c,d are in G.P.show that: (ab+bc+cd)^(2)=(a^(2)+b^(2)+c^(2))(b^(2)+c^(2)+d^(2))

If a,b,c are in H.P and ab + bc ca = 15, then ca =

a,b,cx in R^(+) such that a,b, and c are in A.P.and b,c and d are in H.P.then ab=cd b.ac=bd c.bc=ad d.none of these

If a,b,c,d are in G.P.prove that: (ab-cd)/(b^(2)-c^(2))=(a+c)/(b)

If a,b,c.d be in H.P.then prove that ab+bc+cd=3ad

If a,b,c,d are positive numbers such that a,b,c are in A.P. and b,c,d are in H.P., then : (A) ab=cd (B) ac=bd (C) ad=bc (D)none of these

If a,b,c,d are in GP then show that (a-b+c)(b+c+d)=ab+bc+cd

If a,b, and c are in H.P.then th value of ((ac+ab-bc)(ab+bc-ac))/((abc)^(2)) is ((a+c)(3a-c))/(4a^(2)c^(2)) b.(2)/(bc)-(1)/(b^(2)) c.(2)/(bc)-(1)/(a^(2)) d.((a-c)(3a+c))/(4a^(2)c^(2))

If a,b,c,d are in proportion,then ab=cd (b) ac=bdad=bc(d) None of these