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PLEASE HELP 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. 1) -105 2) -101 1/9 3) 305 4) 303 8/9
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PLEASE HELP

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.

1) -105
2) -101 1/9
3) 305
4) 303 8/9

User Kukabi
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hello here is a solution : 
PLEASE HELP The 4th term in a geometric sequence is -15, the 5th term is 45, and the-example-1
User Czardoz
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