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Modular Arithmetic
medium
0:00.0
Determine the number of solutions to
x
2
≡
1
(
m
o
d
20
)
x^2 \equiv 1 \pmod{20}
x
2
≡
1
(
mod
20
)
.
A
2
2
2
B
4
4
4
C
6
6
6
D
8
8
8
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