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Modular Arithmetic
medium
0:00.0
Solve
x
2
≡
−
1
(
m
o
d
13
)
x^2 \equiv -1 \pmod{13}
x
2
≡
−
1
(
mod
13
)
.
A
x=2, 11
B
x=5, 8
C
x=3, 10
D
x=4, 9
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