Find the sum of the geometric series with a1=343, r=-1/7, and a4=-1

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Jwdehaan · Answer 1 · 2019-10-14T01:24:17+0000

Try this suggested option:
1. rule for the sum of this geometric series is:

S= (a_1)/(1-r);

2. according to the rule above:

S= (343)/(1+ (1)/(7))= (343*7)/(8)=300.125

answer: 300.125

P.S. note, that in this formula a₄ is not included.