If f(x) = * 20 c x, , , , , , ,x Q 0, , , , , , ,x Q .;g(x) = * 2… - Vidyadip

MCQ

If $f(x) = \left\{ {\begin{array}{*{20}{c}}
{x,\,\,\,\,\,\,x \in Q}\\
{0,\,\,\,\,\,\,x \notin Q}
\end{array}} \right.;g(x) = \left\{ {\begin{array}{*{20}{c}}
{x,\,\,\,\,\,\,x \in Q}\\
{0,\,\,\,\,\,\,x \notin Q}
\end{array}} \right.$ then function $(f -g)$ is :-

✓
One-one onto
B
One-one but not onto
C
Onto but not one-one
D
Neither one-one nor onto

✓

Answer

Correct option: A.

One-one onto

a

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