Question: Let be a convergent series with sum S, and let c be a constant. Then, is a convergent series whose sum is c S.

Letk=1

be a convergent series with sum S, and let c be a constant. Then,

is a convergent series whose sum is c · S. Make a geometric picture to illustrate why this is true when c = 2 and the terms ak are all positive.

k=1

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