SOLUTION: hi there. i need help with this problem: prove the sum of the first n term of a geometric sequence ...

Algebra.Com
Question 438222: hi there.
i need help with this problem: prove the sum of the first n term of a geometric sequence ...

Answer by robertb(5830)   (Show Source): You can put this solution on YOUR website!
+...+
=a(+...+)
=a(+...+)*
=a*
This formula is valid only when |r| < 1.

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