Asked by cyn

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

Thanks for your help!

Answers

Answered by 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.
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