The binomial expansion is usually expressed as:
[note: (n,r)=(n,n-r), so (n,n-2)=(n,2)]
so term n-2 is
and the coefficient
[n(n-1)/2!]*[4^(n-2)]* = -9/64
Solve for n by trying various values of n that gives -9/64 on the left-hand side.
I get n=1/2.
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