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10 questions from this quiz
Sum of specific number of geometric terms
Multiply by the common ratio
The first term
First term already represents r0=1r^0 = 1r0=1
Sn=a(1−rn)1−rS_n = \frac{a(1 - r^n)}{1 - r}Sn=1−ra(1−rn)
Sn=a(rn−1)r−1S_n = \frac{a(r^n - 1)}{r - 1}Sn=r−1a(rn−1)
r≠1r \neq 1r=1
n×an \times an×a
Alternating positive and negative terms
r=T2T1r = \frac{T_2}{T_1}r=T1T2
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