Guest Session: 1 Question Remaining.
Create Account
to save progress.
Login
Geometric Sequences
hard
0:00.0
If
a
1
=
1
,
r
=
−
2
a_1=1, r=-2
a
1
=
1
,
r
=
−
2
, find
S
5
S_5
S
5
.
A
11
11
11
B
−
11
-11
−
11
C
31
31
31
D
−
31
-31
−
31
Submit Answer