Find the sum of the first eight terms of each of these geometric series. a. 3 +

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Find the sum of the first eight terms of each of these geometric series.
a. 3 + 6 + 12 + 24 +… 

b. 128 + 64 + 32 + 16 +…

c. 1 − 2 + 4 − 8 +… 

d. 243 + 162 + 108 + 72 +…

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