What is the value of \(\frac{1}{{{x^{\left( {p - q} \right)}} + 1}} + \frac{1}{{{x^{\left( {q - p} \right)}}\; + \;1}}?\)

What is the value of \(\frac{1}{{{x^{\left( {p - q} \right)}} + 1}} + \frac{1}{{{x^{\left( {q - p} \right)}}\; + \;1}}?\)
1). 0
2). 1
3). x^(p-q)
4). x^{(p + q)}

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