Answer:
-9
Step-by-step explanation:
s_15 = {- 9 [ 1- (-1)^15]} / [1- (-1)]
s_15 = [- 9(2)] / 2
s_15 = - 9
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Answer:
-9
Step-by-step explanation:
s_15 = {- 9 [ 1- (-1)^15]} / [1- (-1)]
s_15 = [- 9(2)] / 2
s_15 = - 9