Guest Session: 1 Question Remaining.
Create Account
to save progress.
Login
Arithmetic Sequences
easy
0:00.0
Find
d
d
d
if
a
1
=
0
a_1=0
a
1
=
0
and
a
21
=
100
a_{21}=100
a
21
=
100
.
A
5
5
5
B
4
4
4
C
10
10
10
D
5.5
5.5
5.5
Submit Answer