−15
−14
−13
−12
Correct answer is B
Sr = a1−r
−110 = 18×11−r
−110 = 18(1−r)
−110 = 18−8r
cross multiply...
-1(8 - 8r) = -10
-8 + 8r = -10
8r = -2
r = -1/4
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