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OpenStudy (purplemexican):
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OpenStudy (purplemexican):
rishavraj (rishavraj):
sum of infinite series when \[-1 < r < 1\] is \[\frac{ a_1 }{ 1 - r }\]
OpenStudy (mathstudent55):
Use the formula we used in the last problem which rishavraj has written above. The first term is right there. Find r, the common ratio, by dividing a term by its previous term.
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