If a,b,c be in A.P. and b,c,d be in H.P., prove that ad=bc.

If a,b,c are in A.P and a,b,d are in G.P, prove that a,a-b,d-c are in G.P.

If a,b,c,d are in H.P.then prove that a+d>b+c

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 be in H.P.then prove that ab+bc+cd=3ad

If the angles A,B,C of a triangle are in A.P. and sides a,b,c, are in G.P., then prove that a^2, b^2,c^2 are in A.P.

If a,b,c are in A.P. b, c,d are in G.P. and c,d,e are in H.P., then which one of the following is true :

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 and d are in H.P.,then prove that (b+c+d)/a,(c+d+a)/b,(d+a+b)/c and (a+b+c)/d, are in A.P.

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