What is the formula for finding a1 in the geometric series sn=48455, r=3.2, n=3?

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10-06-2016
Mathematics

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What is the formula for finding a1 in the geometric series sn=48455, r=3.2, n=3?

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HomertheGenius HomertheGenius · Answer 1 · 2016-06-17T13:31:02+02:00

HomertheGenius HomertheGenius

17-06-2016

The formula for finding the sum in the geometric series:[tex] S_{n}=a_{1} * \frac{ r^{n} -1}{r-1} [/tex] For finding a1:[tex] a_{1} = \frac{ S_{3}*(3.2-1) }{ 3.2^{3}-1 } = \frac{48455*2.2}{32.768-1}= \frac{106601}{31.768}=3355.6094 [/tex]

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