wizkids08 wizkids08

30-05-2017
Mathematics

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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

Respuesta :

ghanami ghanami

30-05-2017

hello here is a solution :

Ver imagen ghanami

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