Which expression gives the same result as ∑4i=0(5)(1/3)i

I'm assuming which expression gives the same result as ∑^4
The choices are:
i=0^(5)
(1/3)^i

The second option is correct since the first option is erroneous or makes little sense. The second option and the ∑^4 are geometric progressions which will account for each other when substituted together or one into another. 

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