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Divisibility
hard
0:00.0
Which of these integers
n
n
n
satisfy
n
2
≡
n
(
m
o
d
10
)
n^2 \equiv n \pmod{10}
n
2
≡
n
(
mod
10
)
?
A
0
0
0
B
1
1
1
C
5
5
5
D
6
6
6
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