B is a function because a function cannot have an X value with more than one Y value.
Recall Euler's theorem: if 
, then
where 
is Euler's totient function.
We have 
- in fact, 
for any 
since 
and 
share no common divisors - as well as 
.
Now,
where the 
are positive integer coefficients from the binomial expansion. By Euler's theorem,
so that
Answer:
29.6666666667
Step-by-step explanation:
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