Find the coefficient of X3 in (x-1 / x) 9 expansion
R + 1 is
T(r+1)=C(9,r)x^(9-r)*(-1/x)^r
So 9-r-r = 3
So r = 3
T4=C(9,3)*x^6*(-1/x)^3=-84
That is, the coefficient of X3 in (x-1 / x) 9 expansion is - 84
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