Question

"72. Let \\( f ( x ) = \\left\\{ \\begin{array} { c c } { x } & { \\text { if } x \\text { is rational } } \\\\ { \\begin{array} { l l } { \\text { (A) equal } \\operatorname { to } 0 } & { \\text { if } x \\text { is irrational } } \\end{array} } & { \\text { then } \\lim _ { x \\rightarrow 0 } f ( x ) \\text { is } } \\\\ { \\begin{array} { l l } { \\text { (A) equal to } 0 } & { \\text { (B) equal to } 1 } \\\\ { \\text { (C) equal to } - 1 } & { \\text { (D) indeterminate } } \\end{array} } \\end{array} \\right. \\)"

Answer 1