2,x,y are the first three terms of an arithmetic sequence.If the 2nd term is decreased by 1.The three terms will form a geometric sequence.calculate x and y

Question

and my working out is that if i said x-1

Answer 1

using the common difference of the AP, you know that

x-2 = y-x

Using the common ratio of the GP, you know that

(x-1)/2 = y/(x-1)

So, solve those two equations to get x and y.