Different numbers x,y and z are the first three terms of geometric progression with common ratio r, and also the first, second and fourth terms of an arithmetic progression.
a) Find the value of r
b)Find which term of the arithmetic progression will next be equal to a term of the geometric progression.

Question

anonymous · Answer

Well the geometric is x, y, z and they equal x, x*r, x*r^2 and they also equal x, x+d and x+3d - so substitute t o get rid of d and you will find r... That should set you on your way.