`a ,b ,c x in R^+` such that `a ,b ,a n dc` are in A.P. and `b ,ca n dd` are in H.P., then `a b=c d` b. `a c=b d` c. `b c=a d` d. none of these

If a,b, and c are in A.P and b-a,c-b and a are in G.P then a:b:c is

a,b,c,d in R^+ such that a,b and c are in H.P and ap.bq, and cr are in G.P then p/r+t/p is equal to

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 ,b ,c ,d in R^+ and a ,b ,c,d are in H.P., then (a) a+d > b+c (b) a+b > c+d (c) a+c > b+d (d)none of these

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 1/(b-a)+1/(b-c)=1/a+1/c , then A. a ,b ,a n dc are in H.P. B. a ,b ,a n dc are in A.P. C. b=a+c D. 3a=b+c

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,b,c are in H.P , b,c,d are in G.P and c,d,e are in A.P. , then the value of e is

If a ,b ,a n dc be in G.P. and a+x ,b+x ,a n dc+x in H.P. then find the value of x ( a,b,c are distinct numbers) .

If a ,b ,a n dc are in A.P. p ,q ,a n dr are in H.P., and a p ,b q ,a n dc r are in G.P., then p/r+r/p is equal to a/c-c/a b. a/c+c/a c. b/q+q/b d. b/q-q/b