Question
यदि $f(x) = \left\{ \begin{array}{l}x,\;\;{\rm{if\, }}x\,{\rm{ \,is \,rational\, }}\\ - x,\;{\rm{if \,\,}}x\,{\rm{\, is\, irrational\,}}\end{array} \right.,$ तब $\mathop {\lim }\limits_{x \to 0} f(x) =$
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