Problem: If xî€ =y and the sequences x,a1​,a2​,y and x,b1​,b2​,b3​,y each are in arithmetic progression, then (a2​−a1​)/(b2​−b1​) equals
Answer Choices:
A. 32​
B. 43​
C. 1
D. 34​
E. 23​
Solution:
b2​−b1​a2​−a1​​=(y−x)/4(y−x)/3​=34​.