Determine the first term for each geometric series?

Sn=3932.4 tn=4915.2 R=-4 or:Sn=3932.4 tn=4915.2 R=-4

Sn=3932.4 tn=4915.2 R=-4

or:Sn=3932.4 tn=4915.2 R=-4

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