If cot A = $\frac{n}{(n + 1)}$ and cot B = $\frac{1}{(2n + 1)}$, then what is the value of cot (A + B)?

If cot A = $\frac{n}{(n + 1)}$ and cot B = $\frac{1}{(2n + 1)}$, then what is the value of cot (A + B)?
1). -1
2). 0
3). 1
4). 2

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