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Which summation formula represents the series below? 12 – 24 + 48 – 96
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Which summation formula represents the series below? 12 – 24 + 48 – 96

User Tokkot
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Answer: B

Explanation:

Which summation formula represents the series below? 12 – 24 + 48 – 96-example-1
User Sambasiva
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The summation formula for the series given by:
12 – 24 + 48 – 96
will be calculated as follows:
first term,a=12
common ratio=+/-2
thus the sum will be:
(i=1)Σ[12(-2)^(i-1)]

Thus the answer:
(i=1)Σ[12(-2)^(i-1)]
User Mladen
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