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Modular Arithmetic
hard
0:00.0
Given
p
=
7
p=7
p
=
7
, how many elements
x
x
x
satisfy
x
2
≡
2
(
m
o
d
7
)
x^2 \equiv 2 \pmod{7}
x
2
≡
2
(
mod
7
)
?
A
0
B
1
C
2
D
7
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