Which expression represents the second partial sum for

Answer:
[tex]S_{2} = 3\cdot \left(\frac{1}{2} \right)^{0} + 3\cdot \left(\frac{1}{2} \right)^{1}[/tex]
Step-by-step explanation:
The first partial sum is:
[tex]S_{1} = 3\cdot \left(\frac{1}{2} \right)^{0}[/tex]
The second partial sum is:
[tex]S_{2} = 3\cdot \left(\frac{1}{2} \right)^{0} + 3\cdot \left(\frac{1}{2} \right)^{1}[/tex]
Which represents the option A.