The value of ( $\frac{1}{(p-n)(n-q)}$ + $\frac{1}{(n-q)(q-p)}$ + $\frac{1}{(q-p)(p-n)}$ is

The value of ( $\frac{1}{(p-n)(n-q)}$ + $\frac{1}{(n-q)(q-p)}$ + $\frac{1}{(q-p)(p-n)}$ is
1). 1
2). 0
3). p+q+n
4). 2n/p+q

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