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Modular Arithmetic
hard
0:00.0
Calculate the value of
∑
k
=
1
6
k
2
(
m
o
d
7
)
\sum_{k=1}^{6} k^2 \pmod{7}
∑
k
=
1
6
k
2
(
mod
7
)
.
A
0
B
1
C
3
D
6
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