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Modular Arithmetic
medium
0:00.0
Which of these satisfies
x
2
≡
−
1
(
m
o
d
17
)
x^2 \equiv -1 \pmod{17}
x
2
≡
−
1
(
mod
17
)
?
A
4
4
4
B
8
8
8
C
13
13
13
D
14
14
14
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