" 124.If "a,b,c,d" are in "H" .P.then "ab+bc+cd" is equal to : "

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

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

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

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

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