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Modular Arithmetic
hard
0:00.0
Find the number of solutions to
x
2
≡
1
(
m
o
d
15
)
x^2 \equiv 1 \pmod{15}
x
2
≡
1
(
mod
15
)
.
A
2
2
2
B
4
4
4
C
8
8
8
D
1
1
1
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