2010005501

SubArea: 
Geometric sequences
Level: 
B
Project ID: 
2010005501
Source Problem: 
1003134701
Accepted: 
0
Clonable: 
1
Easy: 
0
The sum of the first and the second term of a geometric sequence is 2, the sum of the third and the fourth term is 18 and the common ratio is negative. Find the first term.
−1
1
2
12
−2