Guest Session: 1 Question Remaining.
Create Account
to save progress.
Login
Modular Arithmetic
medium
0:00.0
Evaluate
ϕ
(
18
)
\phi(18)
ϕ
(
18
)
.
A
6
6
6
B
8
8
8
C
9
9
9
D
12
12
12
Submit Answer