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Modular Arithmetic
hard
0:00.0
What is the value of
ϕ
(
2
n
)
\phi(2^n)
ϕ
(
2
n
)
?
A
2
n
−
1
2^{n-1}
2
n
−
1
B
2
n
−
1
2^n - 1
2
n
−
1
C
n
n
n
D
2
n
2^n
2
n
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