Algebra II (Geometric Series)

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What is the sum of the following geometric series:

1+1/4+1/16

• Algebra II (Geometric Series) -

looks like a GS where
a = 1 , r = 1/4

but with only 3 terms, why not just add them up
1 + 1/4 + 1/16
= (16 + 4 + 1)/16
= 21/16

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