Level:
Project ID:
1003112812
Accepted:
1
Clonable:
0
Easy:
0
The sum \( s_3 \) of the first three terms of a geometric sequence is \( 21 \) and its common ratio is \( -2 \). Which of the following (in)equalities is true for the first term of the sequence?
\( a_1 > 0 \)
\( a_1 < 0 \)
\( a_1 = 0 \)
\( a_1 < a_2 \)
\( a_1 > s_3 \)