Geometric sequence?
2018-10-29 12:32 pm
If the nth term and (n+2)th term of geometric sequence are 81 and 9 respectively, find the (n+1)th term
回答 (1)
2018-10-29 1:34 pm
✔ 最佳答案
If the nth term and (n+2)th term of geometric sequence are 81 and 9 respectively, find the (n+1)th termSol
r^2=9/81=1/9
r=+/-1/3
(1) r=1/3
(n+1)th term=81*1/3=27
(2) r=－1/3
(n+1)th term=81*(－1/3)=－27
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