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OpenStudy (anonymous):
Write an explicit formula for a1=1, r=0.5
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OpenStudy (anonymous):
For what? Sum?
OpenStudy (anonymous):
naw its gemoethric sequence
OpenStudy (anonymous):
I can see that, but expression for what? the sequence? if it's sequence then, \[1 + \frac{1}{2} + \frac{1}{4} + \ldots \]
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