" If "2(y-a)" is the HM between "y-x" and "y-z," then "x-a,y-a,z-a" are in "

If 2 (y - a) is the H.M. between y - x and y - z then x-a, y-a, z-a are in

If 2 (y - a) is the H.M. between y - x and y - z then x-a, y-a, z-a are in (i) A.P (ii) G.P (iii) H.P (iv) none of these

If 2 (y - a) is the H.M. between y - x and y - z then x-a, y-a, z-a are in (i) A.P (ii) G.P (iii) H.P (iv) none of these

If 2(y-a) is the harmonic mean between y-x and y-z then x-a, y—a and z-a are in

If y is the H.M. between x and z, prove that, (1)/(y-x) + (1)/(y-z) = (1)/(x) + (1)/(z) .

If x,y,z be three numbers in G.P. such that 4 is the A.M. between x and y and 9 is the H.M. between y and z , then y is

If x,y,z be three numbers in G.P. such that 4 is the A.M. between x and y and 9 is the H.M. between y and z , then y is