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10 questions from this quiz
Sn=a(rn−1)r−1S_n = \frac{a(r^n - 1)}{r - 1}Sn=r−1a(rn−1)
Multiply by rrr then subtract
a=2a = 2a=2, r=−3r = -3r=−3
97656
-364
5
Sn=anS_n = anSn=an
8
Trial-and-error
To avoid negative denominators
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