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10 cards from this deck
Sum of specific number of terms from geometric sequence
Constant value that multiplies each term
Tn=a⋅r(n−1)T_n = a \cdot r^{(n-1)}Tn=a⋅r(n−1)
First term
Common ratio (constant multiplier)
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
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