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It is a G.P with Common ratio 1/2

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\[S = \frac{ a(1r^n) }{ 1r }\]

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Where n = 5
a= 1 st term

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I'm guessing r is the ratio which is 1/2?

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Am I right? Or no?

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Yup u r correct

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Ok cool! Thanks a lot! :)

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Welcome