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10 questions from this quiz
A common ratio between consecutive terms
un=arn−1u_n = ar^{n-1}un=arn−1
Divide a term by its previous term
a=2a = 2a=2
r=12r = \frac{1}{2}r=21
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Sn=a(1−rn)1−rS_n = \frac{a(1-r^n)}{1-r}Sn=1−ra(1−rn)
r=−4r = -4r=−4
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Logarithms
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