Guest Session: 1 Question Remaining.
Create Account
to save progress.
Login
Arithmetic Sequences
hard
0:00.0
Find
a
10
a_{10}
a
10
if
S
10
=
100
S_{10}=100
S
10
=
100
and
S
9
=
81
S_9=81
S
9
=
81
.
A
19
19
19
B
10
10
10
C
9
9
9
D
1
1
1
Submit Answer