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