C-01-Q136: For $F(x) = \sqrt{1 - x}$, which of the following is undefined?

C-01-Q136: For $F(x) = \sqrt{1 - x}$, which of the following is undefined? | প্রশ্ন করি

For F(x)=1−xF(x) = \sqrt{1 - x}F(x)=1−x​, which of the following is undefined?