Question

If first term of non-constant GP be $\frac 18$ and every term is AM of next two, then $\displaystyle\sum_{r=1}^{20} T_r- \displaystyle\sum_{r=1}^{18} T_r$ is

• A. 215
• B. –215
• C. –218
• D. 218

Answer 1

Answer: (B)

–215

Answer 2

The correct option is (B): –215