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In a geometric series S4 = 64 and r = -2/3. The first term in the sequence is?

Thanks for your help!
15 years ago

Answers

drwls
Is Sn the nth sum or the nth term?

If S4 is the 4th TERM, then
S3 = (-3/2)S4 = (-3/2)*64 = -96

S2 = (-3/2)*S3 = 144
S1 = -216

If S4 is the sum of the sequence of 4 terms, then you have to solve a more complicated equation to get S1.
15 years ago

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