91- 6303239042
For $$\left( A x^p + \frac{B}{x^q} \right)^n$$, the constant term occurs when:
$$ p(n-r) - q r = 0 $$
Solve for $$r$$, then substitute into $$T_{r+1} = \binom{n}{r} A^{n-r} B^r$$.
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