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