Question 842117
an = a + (n - 1)d
2=a
x = 2 + d
y = 2 + 2d
Geometric 
1=t

x-1 =  r,
y-1 = r^2,
x = 2 + d,
y = 2 + 2d

answer: 
d = 0,   r = 1,   x = 2,   y = 2

arithmetic
2,2,2
geometric
1,1,1