If `a ,b ,c` are in A.P., the `a/(b c),1/c ,1/b` will be in a. A.P b. G.P. c. H.P. d. none of these

If a , b ,a n dc are in G.P., then a+b ,2b ,a n db+c are in a. A.P b. G.P. c. H.P. d. none of these

If a^2+b^2,a b+b c ,a n db^2+c^2 are in G.P., then a ,b ,c are in a. A.P. b. G.P. c. H.P. d. none of these

If a x^3+b x^2+c x+d is divisible by a x^2+c ,t h e na ,b ,c ,d are in a. A.P. b. G.P. c. H.P. d. none of these

If a ,1/b ,a n d1/p ,q ,1/r from two arithmetic progressions of the common difference, then a ,q ,c are in A.P. if p ,b ,r are in A.P. b. 1/p ,1/b ,1/r are in A.P. c. p ,b ,r are in G.P. d. none of these

If sin(y+z-x),sin(z+x-y),"sin"(x+y-z) are in A.P., then t a n x ,tany ,tanz are in (a)A.P. (b) G.P. (c) H.P. (d) none of these

If a,b,c are in A.P. then (a-b)/(b-c) is equal to ………….

If in a progression a_1, a_2, a_3, e t cdot,(a_r-a_(r+1)) bears a constant atio with a_rxxa_(r+1) , then the terms of the progression are in a. A.P b. G.P. c. H.P. d. none of these

If a,b,c are in A.P., then a^(3)+c^(3)-8b^(3) is equal to

If x ,y ,z are real and 4x^2+9y^2+16 z^2-6x y-12 y z-8z x=0,t h e nx , y,z are in a. A.P. b. G.P. c. H.P. d. none of these

If a, b, c are in A.P. then show that 3^(a), 3^(b), 3^(c) are in G.P.