What is the value of \(\sum_{i = 1}^3 (4 \times (\frac{1}{2})^{i - 1})\)
This is \(\sum_{i=1}^34\times(\frac{1}{2})^{i-1}=4\times 1+4\times \frac{1}{2}+4\times \frac{1}{4}\)
You should be able to finish from here.
