Find the sum to infinity of each of the following geometric series. a. b. 1 + 0.1

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Find the sum to infinity of each of the following geometric series.

a.

b. 1 + 0.1 + 0.01 + 0.001 +…
c. 40 − 20 + 10 − 5 +… 

d. −64 + 48 − 36 + 27 −…

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