Algebra Ch 48: Sequences and Series (29 of 34) How to Derive This Infinite Sum Equation?

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We will derive the equation: S(infinity)= a1/(1-R)
And given: 2+1+1/2+1/4+1/8+…, Sn= a1(1-R^n)/(1-R)
Find: S(infinity)=?

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