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what answer does she have..?

so is C right?

\[(-1)^{n} * (2)^{2n-1}\]
is useful?
i can solve 99 percent of math questions

99% are you sure @mahdi2020?

yes sure
i`m a engeenier

ok but I don't understand what is the right answer?

you can check the answers
input n=1, 2 3 , ...
my ans is ok