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# help

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What is the value of $$\sum_{i = 1}^3 (4 \times (\frac{1}{2})^{i - 1})$$

Apr 20, 2020

#1
+29956
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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.

Apr 20, 2020