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PLEASE EXPLAIN The 4th term in a geometric sequence is -15, the 5th term is 45 and the 6th term is -135. Find the sum of the first 7 terms. a) -105 b) -101 1/9 c) 305 d) 303 8/9
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PLEASE EXPLAIN

The 4th term in a geometric sequence is -15, the 5th term is 45 and the 6th term is -135. Find the sum of the first 7 terms.

a) -105
b) -101 1/9
c) 305
d) 303 8/9

User Kirill Kitten
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hello here is a solution : 
PLEASE EXPLAIN The 4th term in a geometric sequence is -15, the 5th term is 45 and-example-1
User Ken Keenan
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