1003124704

SubArea: 
Geometric sequences
Level: 
A
Project ID: 
1003124704
Accepted: 
1
Clonable: 
0
Easy: 
1
The 10th term of a geometric sequence is 1 and the 15th term is −1. Find the recursive formula of the sequence.
a1=−1, an+1=−an
a1=1, an+1=−an
a1=−1, an+1=an
a1=1, an+1=an
a1=−1, an+1=an−1