If a,b,c be in A.P, b,c,d are in G.P and c,d,e are in H.P, then a,c,e are in ...........................
Let A, B, C, D and E be such that A,B and C are in A.P ; B,C and D are in G.P; and C, D and E are in H.P; then A,C and E are in