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OpenStudy (anonymous):
Evaluate S5 for 300 + 150 + 75 + …
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OpenStudy (mizuki):
wat is the question??
OpenStudy (anonymous):
that is the question thats all it says and it gives me 4 answer choices
OpenStudy (amoodarya):
this is (sum of)geometric sequenc \[a+\frac{a}{2}+\frac{a}{4}+...=\frac{a}{1-\frac{1}{2}}\]
OpenStudy (amoodarya):
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