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in binomial expansion of (3-2/x)^9 find the 5th term using the general term of the binomial expansion and check your answer

(3-2/x)^9

used formula

=N!/(n-r)!r! * A^(n-r) * b ^ r

r= 4

a= 3

b= - 2/x

n=9

got a answer of -489888/x^4

How do i go about checking my answer??