Asked by hey
Given: Geometric sequence t2= 15, t3= 45, tn = 405. Find: Sn.
Answers
Answered by
oobleck
t3/t2 = 45/15 = 3
so,
a=5
r=3
tn = 5 * 3^(n-1)
so,
a=5
r=3
tn = 5 * 3^(n-1)
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