The geometric series a+a r+a r^{2}+\cdots has a sum of 7 , and the terms involving odd powers of r have a sum of 3 . What is a+r ?
Answer Choices
A. \dfrac{4}{3}
B. \dfrac{12}{7}
C. \dfrac{3}{2}
D. \dfrac{7}{3}
E. \dfrac{5}{2}
The geometric series a+a r+a r^{2}+\cdots has a sum of 7 , and the terms involving odd powers of r have a sum of 3 . What is a+r ?
Answer Choices
A. \dfrac{4}{3}
B. \dfrac{12}{7}
C. \dfrac{3}{2}
D. \dfrac{7}{3}
E. \dfrac{5}{2}