Problem: If x,2x+2,3x+3,… are in geometric progression, the fourth term is:
Answer Choices:
A. −27
B. −1321​
C. 12
D. 1321​
E. 27
Solution:
The common ratio is x2x+2​=2x+23x+3​=23​,xî€ =0,xî€ =−1
∴2x+2=23​x,x=−4∴ the 4 th term is (−4)(23​)3=−1321​