1003107308

SubArea: 
Geometric sequences
Level: 
A
Project ID: 
1003107308
Accepted: 
1
Clonable: 
0
Easy: 
0
The first five terms of a geometrical sequence are: −2, 1,−12, 14,−18. Find the recursive formula of this sequence.
a1=−2; an+1=an⋅(−12), n∈N
a1=−2; an+1=an⋅(−14), n∈N
a1=−2; an+1=an⋅12, n∈N
a1=−2; an+1=an⋅(−12)n, n∈N